Sorry, I'm not on the Forums much do to work. I have three Nova Freedoms which are the same as the Aspen. So far I really like them even if they are kinda ugly, lol. As with anything made in China it's a gamble whether you get one that works as it should or is a nightmare constantly needing repairs. I bought mine from American Tactical a couple of years ago as parts guns for a little over $100 each shipped. I think the Parts guns were ones people had bought and returned and AT didn't want to or didn't have the time to troubleshoot what, if anything, was wrong with them. Two of the three were great - no problems. The third wouldn't pump up and I still need to figure out what's wrong. There are a lot of posts on the GTA ( Gateway To Airguns) forum about them. Everything from modifications to repairs. There is/was one member swagging heavier slugs also that really work well. I liked the option to hand pump up to PCP levels and the ability to shoot up to 10 pellets or slugs before pumping again. Some guys shoot one or two pellets then pump a few times to get the pressure topped off. I bought three Parts guns for the price of one at the regular price hoping at least one would be good and the other two would be good for spare parts. I sold one of the good ones for what I had in it and still need to figure out why one won't hold pressure. It's probably a bad O-ring. A couple of things you want to do is keep the seals lubricated more than what the instructions advise and don't pump it up all at once. I do sets of 10 pumps then let it cool down. I hope this helps!