I picked up a pair in really nice condition about a year ago, including padded covers for a pretty decent price. I had been interested in them for a while and found ONE on reverb LOCALLY (very lucky) and it turned out when I contacted the guy to check it out, he had the pair PLUS an NX2 2x12. So I figured I would probably end up within SOMETHING.
Anyway, I thought the one cab by itself (with my ShuttleMax 9.2) was really nice, but then convinced him to setup the other one as well. I felt like this would be a rig that I could use for basically any gig (and a single for smaller/medium gigs).
I will concur with Wasnex about the low mids. Warm and wide is a pretty accurate assessment I think. But I wouldn't say they're particularly "sterile" or bright in the highs. I run the tweeters at noon (ie halfway down). If I want to do something really fuzzy sometimes I'll back them off to more like 25% or less. For reference, I'm primarily using them with my SM 9.2 and a "modern" active 6 string. The bass can be a bit tricky to get dialed in in general, but I am able to get some really nice sounds with this setup, that I'm not sure would be possible with just any amp/cab setup. Since I have a pair, I haven't really pushed them that much, since I've mostly been able to use them for home practice. I did one LOUD metal gig with the pair, and they worked great for that. I also used a single one to rehearse with that band, and it was loud enough although I would have liked to have more space to get out in front of it, or raise it up (typical tiny practice room where everyone is kind of on top of each other).
I will agree on the ergonomics as well. It's a pretty deep and kind of square-ish cabinet. I'm a little under 6 feet and have reasonably long arms and I can kind of just about hold the cabs in front of me like a box of books. With the handles by yourself, they would be kind of in front of your legs. BUT, with one person on each handle with the cab between them, no problem. 58 pounds is not light for one person, but also not unmanageable. Two people helps with the bulk and makes the weight negligible. Most sane people probably only need or want one. I have some little furniture dollies that I got from harbor freight for cheap, so I use those to roll the cabs around at home, or venues, etc...
Like most things that may be a little more tricked out (think old sports cars), there may be some compromises and trade-offs. But these are very high quality cabs. The build quality, materials, attention to detail, etc... is very high as with all the Genz stuff. And these were one of the more high end products they made too.
So assuming these cabs are local, I say go try out the GB and EA, and see what you like. Take your BFM cab too and see how they pair (that's not unreasonable if you're serious about making a purchase if you like what you hear).