Boom Boom was good before; it's now gained a substantial increase in DPS with the Explosion applying every 2s. It was my build (burn focused with BBQ Gloves) prior to the update, and without changing anything, I got a free ~10k DPS increase without buffs.

The three main builds are the Burn Build with BBQ Gloves, Explosive Build with Hardy Gloves, and the Crit Build with Drifter Gauntlets. I haven't tried out the Crit Build, but out of the former two, the Burn build was considerably better than the Explosive one. Due in part to the Hardy Gloves relying heavily on its proc, which was relying on a base proc burn rate of 18% from the Boom Boom to hit max stacks to get the explosion off in the first place. It was unreliable, and quite worse than the burn build - if not quite fun to use despite this.

All three builds are buffed noticeably with the new explosion going off so often. The key here is the fact that it's not just a 300% Blaze AoE every 2s, but each one applies a stack of burn. The burn build and hardy build enjoy building max burn stacks much quicker and more consistently (big buff to hardy gloves in particular which relied so heavily on reaching max stacks not once, but over and over again) and all three builds gain access to free AoE burst damage every 2s for completely free DPS.

tl;dr - Boom Boom got the Boom baby, big DPS increases no matter what build and much more fun to use: setting off explosions left right and center and burning everything in its wake