I have no experience with the Bandit, but it is obviously a PCP version of the CP Chinese Co2 pistol; perhaps with a few improvements/refinements (like trigger adjustability, purportedly). But since I've owned and written about the Chinese CP Co2 and Airmax Precision PCP pistols, I'll throw in my two cents here.
I really liked and enjoyed my CP, and managed to adjust the trigger to a very crisp three-pound break with the simple but considerably-less-than-'convenient' factory sear-engagement screw. Hopefully and from what I've read, the Diana Bandit has made that adjustment easier.
The CP (and no doubt the Bandit) has a surprisingly light heft; excellent for offhand shooting, but counter-productive to fine work from a rest. From a sand-bagged bench-rest my CP averaged .80" five-shot groups at 25 yards. Most folks will find that plenty accurate. Every time I shot the CP I thought they should make a PCP version. That said, I'll opine that the Bandit's small chamber-tube will not return many shots per fill, especially at high power. Regardless, it is probably an EXTREME bargain.
My new book, Awesome Air Pistols!, has a chapter on my experiences with the Airmax Precision Chinese PCP pistol (comparing it to the thousand-dollar Kalibrgun Ocelot PCP). The AMP has more heft and chamber capacity than the CP/Bandit, but it did not have as nice balance for offhand shooting as the CP and it took a good bit of tinkering to find its full potentials. That said, aside from the "monkeying" part, I'd bet the quote from the chapter titled Czechmate! would also apply to the Bandit. I may have to find out for myself...
"Though it took no small amount of tinkering, testing and monkeying, the cheap... I mean, BARGAIN Chinese PCP pistol shoots way beyond its price-tag."
