They are a little expensive considering they don't include sites. Overall I like mine reasonably well but it does have a couple issues that I hope SIG will fix, (they have offered to at thier shipping expense). Mine has a canted rail due to an out of spec rail. It also hasn't been as accurate as I've hoped so far, within acceptabilty but I was hopeing for a very accurate rifle.
On the plus side it is Very smooth shooting. It has a very good 2 stage trigger. It has been 100% reliable with reloads, 3 flavors of surplus and factory ammo. The forend may look a little different but it makes it very easy to attatch a bipod, light and other goodies. The buttstock has a storage compartment for batteries and the tube is hollow so you can put a cleaning kit or whatever in it. Using AR mags is a big plus.
Here's a pic:
Samson front and GG&G rear BUIS, GG&G bipod, Eotech 551 with GG&G Accucam, Wilderness CAR II sling with an H&K hook.
Most people I've talked to that own them like them quite well. I may love mine if SIG fixes the accuracy issue when they take care of the rail..............................DJ