Well, sad to say that even the Thunderbolt drive is going back. It was too big (don't believe the Seagate box when it says Ultra Portable), and the TB adapter made it even bigger (like silly big) plus it got hot enough to cook an egg. The battery on my MBA dropped like whale dung in the ocean. Benchmarks showed it was twice as fast as my USB 3.0 drive connected to a USB 2.0 port, but the size and heat are a turn off. I have a Time Capsule I am backing up over Ethernet, so I was tempted to get a desktop sized TB drive but they are ridiculously expensive. I'm going to try the TB to Gigabit Ethernet adapter to see what I can get out of that.
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There is nothing like handling the real thing. You can read all you want, but actual hands on experience trumps reading blogs/articles/forum posts. I for one am glad I could play with one for a couple of days to remove any doubt in my mind that it wasn't worth it.
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How would I connect a firewire drive to my MBA?
Except you did play with it and came to the same conclusions that virtually every review would have told you.