I received the Nissin i40 from B&H. It's certainly a nice size and weight, but it feels so...fragile. Thin little intricate metal arms don't feel like they'll last. The tilt and rotate mechanism feels fragile. The battery door feels like I could pop it off easily. It feels so fragile that I am nervous to leave it on my a7 on a sling strap at my side (whereas I had no such fears with my Canon 420EX). What do other users of the i40 think? Also, are the Sony native flashes any more rugged? Or, are there other 3rd party flashes that might be a bit tougher, but without getting overly massive (compared to the a7 body)?