Things I liked:Pumping this tank up with a hill pump is not bad at all. Beats pumping my discovery at the range. It is light enough to carry in a backpack while hunting. This tank makes shooting much more enjoyable! I pump it while watching television, it takes about 320 pumps from 2k to 3k psi. So in about 3 hours you have it charged enough to fill your discovery 8 times.
The reason I wrote this review was to offer information I attempted to find online that was not available! Pumping the first time from 0 to 3k was a job, maintaining isn't bad at all. If you use the benjamin pump it takes much longer to pump, it took me a week to pump from 0 to 3k with that pump. And 4 evenings to maintain. The hill pump is way faster. Things I would have changed:Nothing, unless they sold a version that pumped itself while I shot! What others should know:If you own a discovery you should definitely invest in this tank and a hill pump. If you don't shoot much, you will not benefit from it. If you shoot a lot, and hunt this tank is a must have. Even if you use a scuba tank to fill your guns, this tank is much more convenient to carry.