I have the CZ 527 Varmint in .223, with the HS Precision stock. I'd prefer that they didn't use the spiderweb pattern on it, but it's a minor, cosmetic complaint.
I've only had mine out at the range once, using American Eagle 55gr FMJ and Winchester 62gr FMJ. I was able to get the rifle sighted in and grouping within 10 rounds. Mine must have a 1:9 twist. It's brand new and I didn't get any keyholing with the 62gr.
I had a little difficulty getting it to feed correctly from the magazine (I only have the one), and think that must be specific to certain calibers. I also have a CZ 527 Carbine in 7.62x39, and it feeds like a champ. No problems with extraction on either rifle. I have not had a problem with scratched up brass, but time will tell.
I'll have to wait to tell you how well it shoots, since I haven't put anything like match or hunting ammunition through it yet, and it was very windy on the day I took it out.
The CZ rimfire rifles are excellent guns for the money. There are few, if any, new centerfire rifles with set triggers that cost as little as the CZ 527 line. There are more accurate rifles out there, but they are probably going to cost more NIB.
jm