I really like the CZ457 action - bought an American to get a light sporter & because I liked the proportions of that stock. Bought a MTR because I wanted to try that odd-shaped stock & match chambered bbl. Then bought the Manners stocked Varmint Precision Trainer because I really enjoy shooting that same Manners stock (PRS1T) on three Vudoo & one Rim-X repeaters - people can have all the new-fangled chassis systems - they don't appeal to me in the least.
I had a couple of CMP Rem 40X actions converted to repeaters to use the V22 magazines, then barreled them myself with Benchmark & Krieger barrels, chambered with an EPS reamer. They both shot great, and were all I could ask for in PRS-style matches. But when Vudoo came on the scene, I just had to try that action, and after barreling it with a 22" Krieger and shooting it for a season of matches, I sold the older 40X repeater and bought another Vudoo, this one purchased as a bbl'd action direct from VGW with a 22" Bartlein in their Kukri contour. I couldn't be happier with the whole Vudoo experience - dealing with Paul & Jill at VGW has been very pleasant & satisfying, enough so that when they came out with the Three-60 action, I bought one and barreled it with another Krieger. Also wanted to get into ARA-style 22RFBR shooting, so bought one of the early V22S single shot actions with the Flavio Fare trigger, barreled it with a Shilen R5 ratchet, and put it into a McMillan Kestros stock. With lot-tested Lapua Center-X, it's amazing to shoot 5-shot groups that often wind up being not 'one ragged hole' but one slightly oversized hole.
After getting used to the consistent accuracy of the 40Xs & V22s with custom barrels, I wasn't satisfied with the CZs' accuracy any more. I sold the MTR, and re-barreled the American & VPT with Shilen ratchet blanks. The American's factory bbl never came close to shooting satisfactory groups - was 2+MOA at 50yds when new, and never really got any better, even after I pulled it and cut a precision 11* crown to replace the ragged, fugly factory crown. I wouldn't have gone to the expense & effort to re-barrel it if it weren't for how smooth & reliable the new 457 actions feed, extract, and eject. And any company that cares enough about customer satisfaction to equip a new action with a fully adjustable trigger in today's world full of hungry lawyers deserves a bit of respect. The CZ457 VPT's 24" bbl wasn't bad to begin with, and had improved a bit by the time I put 500+rds through it. But when I took it out to 100 & 200yds, it really fell on its face - couldn't keep 10rds on an 8" plate at 200. So after enjoying the fine accuracy of the American after doing the Shilen bbl for it, I put an .862" dia straight cylinder Shilen on the VPT, and have been very pleased with it. I hear a lot of reports from satisfied CZ457 owners when it comes to accuracy, but 2 out of 3 not being acceptable in my experience makes me wonder if I was just unlucky or what?