i have read that many have had more trouble with leds and acros and that it is more difficult in getting them to grow quickly and with rich color... Not saying its impossible, but the there seems to be more success with mh and t5. (me included). There is also the issue with shadowing and the amount of leds needed to get good coverage.
That being said. For softies, lps and non-acro sps, the leds do well.