Just received the Proton today, and these are some of my initial impressions.
The body looks just like the old Proton from the side. One of the first things I did was to remove the supplied battery and look at the contacts. They are gold coated but otherwise look like the ones in the older Proton, in which the + contact dropped out the first time I changed the battery. It was sent back and fixed, but I never felt comfortable with it since. I hope the new Proton does not have the same problem, which I understand had been fixed in the later older Protons. The swith is still in the same ploace on the side and is a little too small IMHO. I sometimes have trouble finding the right action spot in the dark.
Although I have read that the new Proton uses an optic, it looks just like a reflector. The large main LED is in the center and the smaller red LED is off to the side about 2 or 3 mm. The output of the main LED is noticeably brighter than the older model and has a much more defined central spot which throws better than the older model with multiple LEDs. The Proton comes in the Point of Sale mode so that you have to hold the button down until the red light goes off (10 - 20 seconds) if you want the light to stay on.
The box said that a belt clip was included. There was a case included but I did not see what I would consider a belt clip. After a close examination of the case I discovered that there was a strip that was held down with velco on the belt loop that could be lifted and placed over the belt. I never knew that was there on the case for the older model, but it was. You really have to look to find it. I guess that is what they call a belt clip.
I like the light overall, and with the better throw with the white light (there is no noticeable tint) it make a better general purpose light than the older model.