I have a Specialized Black lite on my Epic and have absolutely no problems since installing it last season. I prefer having only 3 ride heights. Race height, moderately going down height and got-to-pay-attention-this-is-steep height. I do a lot of steering and maneuvering the bike with my legs against the saddle, so knowing the exact position of where the saddle is going to be is key to me.
I had one of those and also really liked the 3-positions. I swapped to a 150mm KS LEV and while I much prefer the longer throw (versus my Command Post's 120) I'm pretty much indifferent to the infinite adjust.
My LEV has required a bit of cable maintenance but nothing a quick adjustment didn't fix handily (once at Obsession and once at Corsa). I've been running the LEV for 18 months and other than those cable adjustments has worked flawlessly.
There's nothing better than an Orangina after cheating death with Digger.