I now know how to grow sps, and bleach sps with LED.

;D
For me, I would never pay the crazy markup on the premade fixtures. That said, I spent probably a year tweaking the setup I have, and even now can manage to bleach out an entire tank in one day.
What would kill me would be to buy a premade fixture, plug it in, and find that a) it won't grow sps, b) looks like crap c) causes algae issues, etc and that I couldn't change it or tweak it. To get a decent premade fixture, that would have everything (replaceable individual LEDs, dimmability of all the channels, CREE bulbs, etc etc that would do a 125 gal tank, I would expect to pay over $2000. DIY it can be done for under $1000. As one guy mentioned, they even have a solder free option now (which I would highly recommend).
I'm a broken record here, and always risk pissing off the people that bought (X) fixture or the guys that are selling (X) fixtures. So again, this is just my own opinion, and it's definitely not an option for everyone. T5's work well and are hella easy to install, and don't cost as much to run as MH. A good option for many.