For a while, I had 2 Fenix L2D setup on my swingbar (Minoura) for my night commuting. Although it did a pretty good job, I wanted a bit more light - especially at higher speed (20-30mph).
So I bought 2 more lights - this time UltraFire to supplement the Fenix. They were bit disappointing as I didn't find them too bright and didn't mix well with Fenix as it had a similar light pattern, which just made the white spot - whiter. I also didn't like managing 4 light and all that batteries.
So I bought 2 of those SSC lights. Holy crap - now one of this light is replacing the entire setup. The way I have it now is - 1 primary SSC, 2nd (spare or in casebattery runs out on 1st) and 1 fenix mounted on my helmet.
This thing lights up the road and for the first time last night - I see cars waiting for me as they come out of side road or they come up very slow behind me. I think they had a hard time figuring out what was in front of them - maybe they thought is was a motor cycle that was going slow (due to breakdown?). I don't care why, because it works, not only as a front light, but also as a "be seen" light at 12:00am.
I thought I wasn't going to like having non-common battery - but its no different than having a AA battery. You just have to buy them in advance and have enough spare on your bag. In actuality, I think I'll like the lithium battery more as they hold better charge and have longer lifespan than Nimh.
You are absolutely right - they've been out of stock for quite a while (5 and 8 mode version). I just bought 2 mode version, which is perfect for cycling as you only want high or low, depending on your ambient light condition. I'm getting 2 more to replace the fenix on my helmet and a spare.
The lights are much larger than Fenix, so keep that in mind. Instead of Fishblock, I had to use a larger mount. The cost of 2 light and charger/batteries were about equal to 2 fenix lights (last year) without the batteries/charger.