I run an HPA weapon and i think they are completely fair. Mine is doing 330Fps although I could easily crank it up to 350Fps with that being consistent ever shot but i don't plus I also use a speed trigger which mean I can fire as many as i can in semi but looking at the performance of firing it in semi for as fast as my finger can move then it fires just like a PTW. the trigger response on those are good as good if not better without any mods to the trigger.
now i think they hurt more as most HPA users use a heavier BB, mine is doing 330 on .20s but use .28s and if you use the right setup with your barrel, bucking and hop then they can be really good both accuracy and range.
I also have a fully converted GBBR to HPA not the tapped mag thing this one is internally converted and that's fair game as well.