I received the BMAXT on Monday and got to use it last night when I subbed with a band hosting a blues jam. It gave me an opportunity to not only play it for a couple hours with a band, but to also hear two other bass players playing through it as well.
My first impression is that I really like it. It sounded good really good with my US Deluxe Jazz 5. I also got to hear it with a Stingray and a P-Bass when the other guys used it. To me it sounded somewhat "scooped" in the mids, which I like though the guy with the P-Bass fiddled with it the entire time he was on stage and later told me he didn't really care for it.
Anyway, I'm thinking the IOD maybe won't be sticking around and the Grand Prix may get moth balled for a while.
Thanks all for your input!