I bought the Vector Sport Spot 3,000,000 Candle Power at Target, and I have decided to keep it.
The two bulb approach appealed to me because it allows you to use half power and get longer burn time at the bulb's maximum efficiency and without using resistors or a dropping circuit, so it's really efficient. It also lets you operate on one bulb after the first one burns out, of course.
The case leaves a lot to be desired, and you don't get to handle it in the store because of the packaging. It's a thick, rubbery plastic. Taking it apart it seems flimsy, but I also think you could kick it around a lot without hurting it much, and it would not scar up other objects floating around on the floor of your vehicle, as someone complained that the ribs on his metal Costco Vector did.
When I first tried the beam I was impressed with the single bulb, but turning on the second bulb just widened the spot by about double, rather than intensifying the original spot. I took the light apart, and found the bulb held in by a clip with considerable latitude to move. So I moved the second bulb around, and it then gave me a second spot _under_ the original instead of beside it. I will keep trying to get a single double-intense spot, but am wondering if the side-by-side might not be more useful anyway. This light on single bulb has enough range to reach the end of my useful eyesight, unless it's to light up elephants. Maybe somebody with more experience can tell me if there is a point beyond which more intense light is not going to help me see things because they are just too far away, even if they are lit up.
When I walked the light up to a wall, it held the spot configuration until I got really close, like 25 feet, before it spread out.
Don't know about run times yet, since my batteries are not yet fully exercised to reach max capacity. The beam stays on only as long as you press the switch, and I am not sure I want to change that, given the possibilities for the light to flop over and burn something. If so I will use a thick rubber band made of strip of bicycle inner tube.
One of the biggest selling points for me was the 12v socket. It is the inlet for power to charge from a cigarette lighter, but it is also an outlet that lets me run other 12v accessories on the spotlight's batteries. We will be using this in a cabin with a 12v system, and the outlet will let me take my radio or other accessories out to a work site. The Costco Vector does not have that socket.
This light weighs just over 6 pounds (2.8 kilos). Wow. That did not seem so heavy in the store, but it sure does in use. It come with a shoulder strap, but I have not tried that yet.
All in all, I think this was a good buy, and it will take the spookiness out of most any situation on our mountain where a long-throw light is needed.