I can do 4DH up to about GR32 with above average gear (full M5+RORG, 4 x TnT, mix of bows and 2h xbows). Is it fun, but I needed a change.

I am now doing 4 x crusaders using stampede, and honestly I think a LOT more fun. They can take much more abuse than squishy DH can, at least up to about GR 25 where I am currently at as I finish gearing. Plus, being able to speed around everywhere makes things less boring during a long play session.