Yeah . . . Not something a lot of folks like to hear. But doesn't change the fact that it's true. Ultrafire makes the worst 6P clone. Solarforce currently makes the best one.
Very true as I've always felt that the Solarforce L2 is the best Surefire 6P clone out there. Spiderfire probably comes second and they kept theirs thread compatible with Solarforce, whereas Ultrafire changed it for some reason. Also I thought it was funny that a clone gets cloned since Solarforce made the first 6P clone and then eventually the others followed. G&P does have a 6P clone themselves, but they actually made physical design changes and so I really don't consider it a full 6P clone.
Oh and just to copy my post in anther thread:
As a flashaholic, I own several Solarforce L2s and Surefire 6Ps. A few years back I decided to by a Surefire just to see what all the hype was about and also chatting with Gene Malkoff at the time and his development of his early M60 dropins. To be honest, when I first got my first incan Surefire 6P, I was not at all impressed with it. I bought it used off ebay and it still costed me $45 shipped at time. I didn't like the twisty tailcap and to this day, while I can understand why it does what it does, I still don't like it. I then slapped together a cheap P60LED dropin with parts from DX and then I started liking the 6P much more. After that, I went and bought a Surefire C2 body, thinking I could get an aftermarket Head and Tailcap. I then went digging on ebay to see what was out there and I noticed Heads and Tailcaps from brands like G&P and Solarforce. I found that I could get a Solarforce Head and Tailcap for around $20 shipped. I then stumbled upon an ebay dealer that sold a complete Solarforce L2 Xenon for $16 shipped and so I just bought a couple of them. When I got them, I was extremely impressed by the quality of them considering how cheap they were in price. Up until that point, I had already bought many many flashlights from DX or Kaidomain and so my expectations for China made flashlights had already been set fairly low. So when I played around with the first two Solarforce L2s I got, I was so very impressed with the build quality and all. The threads were smooth and the glossy black Type II Ano was to me every bit as good and looked like that on a Maglite.
In comparison, I weighed just the body component of an original Solarforce L2 (pre 18650 version) to a regular Surefire 6P body component and the the Solarforce weights 60 grams and the Surefire weighs 65 grams. Fully assembled without dropin, the Solarforce L2 weighs 105 grams and the Surefire 6P weighs 100 grams. Keep in mind that the standard Solarforce L2 has a strike bezel and the Surefire 6P does not. The inner bore diameter of the Solarforce does seem a little larger (or more loose) than the Surefire so that could account for the 5 grams body part weight difference. The Solarforce body does look about 1mm longer than the Surefire body and the Solarforce tailcap is definitely 8-10mm longer to the tip of the button than the Surefire tailcap. It is true that the chamber of the body tube that accepts the dropin is tapered on the Surefire and so it arguably has "better compatibility" than the Solarforce, but that's why most of the P60LED dropins on the market use an extra spring to secure the dropin and keep it pressed up against the head. I've been able to use Malkoff Devices M60s on my Solarforce L2s, I simply use one of the same type of springs that come with the other P60LED dropins and it works fine. The glass (or pyrex) lens that Surefire uses is about twice as thick as the the glass lens in Solarforce Heads, so it's arguable that the Surefire lens is more durable. Although a poster in this thread did say they replaced their cracked lens Surefire Head with a Solarforce Head and hasn't broken it yet, so I think it depends on how roughly you use your flashlight. For the money, to me it's hands down the a Solarforce L2 is the better value just simply because you are getting a very good flashlight at a relatively inexpensive price. Their new L2P has an awesome HAIII finish, improved knurling, much less aggressive crenulated bezel and a tailstanding crisp feeling clicky tailcap. Again as a flashaholic, I have several Solarforce L2s and Surefire 6Ps and love them all. Though the Solarforce L2 gives the cheap guy in me the gratification that I got a great deal on a great flashlight, the Surefire 6P, not so much. I mean sure I know the Surefire 6P is a great flashlight too and of course the top notch quality is there, but I just don't like the cost factor and to me that's a huge factor as well. Sure they have a great warranty, but I can't see much going wrong with the 6P. The Z41 twisty tailcap is practically impervious to failure (as the nature of a twisty is that) and sure you could probably break the lens, but I just can't see myself calling Surefire much to take advantage of their awesome warranty with the standard 6P. But as a flashaholic, I've bought some anyway so I guess what I've said doesn't make as much sense for me as it should. Still, I was going by the early habits of buying both of them. So again, while I do love both flashlights, I still have to recommend the Solarforce L2 based on value. As a flashaholic, I recommend buying both.