I've got their 3.5" short arm full lift over 80k miles and it's great. took a hit from another car to the front axle recently and while the axle and stock parts got junked the clayton arms were not damaged at all - also have the clayton front adjustable track bar that did not get damaged.
When I ordered my lift, I got the heavier springs in anticipation of bumpers, winch, 37's etc... but haven't added everything on yet so the ride is good but a little stiff - everyone that's driven my jeep thinks the ride is better than stock. I have driven Jeeps with the Enforcer springs and have toyed with the idea of swapping springs since they offer what I feel is a slightly softer daily driver ride. When I'm on the road and loaded down the ride is more like the enforcer spring ride. I have the Bilstein 5100 shocks which I think are getting to their end of life after 80k miles of on and off-road use so this may also be why the ride feels a little harder.
Handling is great, corners etc...I have had it up to 95mph and it tracked solid and straight.
I'm also looking at upgrading to their long arm and cross member and I like their skid plates after seeing it all working together at EJS. I was concerned about the long arm design but for the type of wheeling I do it'll be fine.