I don't have one, but was thinking about it. The Amazon reviews are all over the place. One supposed "Professional" really slammed it. He said it would never stay aligned, etc. Other people love it.
My experience is that Amazon reviews are pretty much worthless unless you know the reviewer, and can put trust in what he says. People post unwarrented reviews on Amazon daily, who knows what their problem is?
One of the finest "trim " contractors I use had a new one he "gave away" for $150 because he couldn't get it to stay in alignment. He replaced it with a Dewalt and has bought 4 since then. Of course he and I are really "pickey" about joints that fit.
I have had the Bosch 4410 and 4410L in the shop for quite a while now and love this saw. Very accurate, handles just about any compound cut I have encountered, plenty of power, everything I have needed. And, it's built very well so it holds alignments, so far, forever.
I have a review of this saw (and a few other miter saws) in my Tool Reviews section, the link below is to the latest Bosch 4410L.
Bosch #4410L Laser-Equipped SCMS Review - NewWoodworker.com LLC
If you can wait a bit Kapex by Festool is rumored to be here soon.
A Sliding Compund Miter Saw with dust control, soft start, moves on linear bearings, mounts close to the wall, double laser, 4 11/16" flat stock cutting depth, 6 5/8" crown height and if they stay true to form ~1.5-2 times the price of current competitors. Since this is not so different from the pack it should not take long to get UL/CSA approval.
Festool IPT
has detailed photos in use.
http://www.festool.co.za/images/artikel/Download_Brochure_KAPEX.pdf
has English details.