Things I liked: It works! This kit fixed my old Benjamin 342. The tool works very well, the seals fit it's all good! The PTFE valve body seal works a treat, I had to hook the old lead seal out with a pick and clean the seating surface. There's a pellet probe 'O' ring that's not needed on the 342 (no 'O' ring fitted on these), but what the heck. Please don't complain about the price of this kit, it's a proper bargain - you should try living in the UK! e.g. a new Bluestreak in the UK costs £300, that's about $475 - I kid you not! I'll put another 4 kits on back order, yes I think they're jolly good.
Things I would have changed: The $50+ shipping charge to the UK, then I got hammered by Her Majesty's Customs and excise (bless the old girl)
What others should know: So it fits my old 342, and it looks like it'll fit my HB20 pumper pistol too. I haven't taken the valve gear apart to check, but it's got the same square valve end cap as the 342. PA's customer support said "rifles only" but I reckon it'll fit.