Yeah. All my buddies are heavily considering the 40" size, but they are UNGODLY wide. 15.5"
Yes, they suck on the road. But thats why you should run them as off road tires mainly. They can get a little squirrely under extremely heavy braking while on wet roads. They also flat spot like a BITCH. It'll take a while for them to round back out.
Off road, air down to 10 psi...you'll dust everyone else. I think they are the bestest tire at, and under 35". Pure performance only beaten by red label tires (i.e. the tires that competition off road buggies use, these tires are EXTREMELY soft and sticky).
They are just about as loud as an SSR, cheaper than an SSR, have thicker sidewalls than an SSR, and outperform an SSR. Did I mention I don't like SSRs??