I've had one of the HF 40 lb. blasters for 12 years, it works ok if you shake it often on high humidity days. It still goes through the sand really quick and blasting is a lot of work. Moisture is the enemy, I recently bought a 15 lb. soda blaster and it's even more susceptible to moisture.
If you want to do a lot of blasting, get a BIG compressor and 10 times more filtering than you think you'll ever need.
I also have a very old blast cabinet that I couldn't live without. I clean all my parts that way.

'65 C-10, 65 L-60, 65 C-80, 72 C-60 & and a bunch of old Chevy cars.
Never time to do it right, always time to do it over.