This guy knows what he is talking about. Great part about it is players enjoy helping and sharing knowledge with other players(esp new ones). So go to your local field, ask players about trying out gear, and have a hay day.I would recommend to go to walk ons and trying them out before buying deffo for goggles!, ask people about what they like about there gear and what they think best way!!
Tippmanns are easy to use. Easy to maintain.
They have loads of extras you can buy for them.
Check out the A5 owners group forum as well for in depth details on the A5.
-EDIT-
I found that after a while I got bored of using my Sierra and bought a proto reflex but I really enjoyed using my tippman. Depending on what you buy they are entry level markers (mid level markers if you buy top end)