I'd been looking at the MXR m81 for some time to replace my Behringer BDI21 because I only use it for the DI and eq. But I've found Darkglass B7K's used going for under $300. I could sell my B3K for at least $200, making the B7K upgrade around $75 or so CHEAPER than just getting the M81. I guess I just need a second opinion on what is a better deal. I've also wondered why the M81 is more expensive than the old M80, which has much more features like distortion and some "color" mid-scoop switch.