I like my new A5 but have shot the SBE2 and really liked it. I'll be getting one at some point but it's on a long list of toys I want..haha
My new A5 has been good and I only had one issue that was my fault. The cap on the tube is somewhat hard to get screwed back on correctly and I unknowingly cross threaded it. I shot it on a duck hunt and blew the cap, tube cap, plug and spring out of it in the water never to be seen again. The barrel of course came detached from the receiver and when I pushed it back down another shell fired off scaring the crap out of me. I sent it back with letter explaining what happened. Even though it was my fault..they went through it, replaced the parts needed, sent it back cleaned and in working order free of charge. It has been shooting flawlessly ever since.
So make sure you get your cap screwed back on good and tight.