I was in the same dilemma myself for at least a week, and I finally bought the 390 Boss' because I found them online for only $115 with free shipping. I did go check out the TT30's in a local shop, but no one had the 390 Boss' to compare them to. The TT30's are definitely light with a low highback. I was leaning towards the 390 Boss' anyways because there is more customization and better dampening, which I wanted for jumping. And I'd go with the Boss' instead of just the normal 390's, might as well for a mere $10 or $15. I assume you know the Boss' have the Yes I Cant system, which it ever more customization.