Mr Heater Buddy throws 4000 btus at Low setting and 9,000 btus at High setting. I believe the coleman blackcat is only rated for 3000 btus.
All I know for sure is that it is a good little heater. Very portable and easy to use, with some very good features (auto shut off if it gets tipped, low oxygen shut-off, 0" clearance required at the back, etc.)
Definetely worth the $$. I got mine at TSC for 59.00 but they will probably be on sale everywhere pretty soon.
Now if I could just catch some damn fish!!!!