My Rohm's love the R10, with very good results, I have a Top and a Sport, both of which the power has been changed and both running about 5ft/lb and out to 20 or even 30 yards they do very well. I also have the trainer, which is CO2, would not bother beyond 10 yards with this....

But the R10 are, for me anyway, I think about the best out there...