I'm waying up the same. There is a detailed set of strip down videos of the P15 on YouTube if you search Artemis P15 which gives you a great idea of the build quality. I've concluded that you get a multi-shot, regulator, and titanium cylinder in a bullpup configuration for a bargin price. If you are able to tune it and it comes with a decent barrel you can have a decent rifle. That said I have no practical experience.
Good Deals with: Gazza, Fred, muts65, Brian747, wombat100, Tweaky (BSAOG), the wizard, delboy, craigy, skygrowler, JTH71, pgm112, Doger21, shootingmad, PHOBUS, bhill22, pmcb, pablo19, BobSki, Petay, Double Tap, Geoff555, Wild dogman, Multijet, BANANAMAN, RapidNick