Anyone have any experience with lowering blocks for sportsters?  I've just put Streetglide air shocks on my 48 which has slightly raised the rear of the bike.  I want to lower it by about 2 inches and was looking at the adjustable lowering kit as well as the Tamarack 1.75 inch kit.  It would be useful to be able to adjust the ride height but the adjustable ones look a little flimsy when compared to the Tamarack block.  I've also looked at the LA Choppers kit but they only come in 1" and seem quite expensive when compared to the other two. 

Was interested if anyone has had any issues using the kits?