The AA S410SL is very reliable...mine is the carbine version. Only problem with it is the trigger safety button....it`s on the trigger.....there`s a hex screw behind the trigger that pushes on a spring, and that spring pushes on a very small ball bearing that holds that safety button. That screw tends to come loose (Many U.K owners have written/complained about that on the U.K Air Arms website/forums). Some have lost parts of the trigger safety components or lost them all....the air rifle will still shoot....just you won`t have a safety. Many have suggested to use abit of nail polish or Blue Loc-Tite to keep that hex screw from backing out.
Other than that....I`ve not read any complains on the AA airguns....PCP or springers. Btw, their magazines are about $50.00 each....think about that when you want extras. The Crosman/Benjamin Marauder is probably abit less powerful.....but their magazines/clips are alot less expensive. The Marauders have not been around too long...maybe a little over a year...so there have been some problems with them (Leaky valves, loose bolt handles and the stocks are mis-aligned etc. ....check some of the posts here at GTA)...but their prices are about half of the AA S410SLs.