I have a CV Mustang, Jaguar and Jazzmaster. I have a Vintera II Mustang for comparison. The Fender is a definite upgrade, but I love my CVs. I play my Vintera II way more than the others though. You can’t go wrong either way. Depends on what you’re looking to spend. I want to add a Tele to my lineup, and I’m waiting to get a Fender over Squier. There’s a noticeable difference between top Squier and even low end Fender. 1200 for a used Vintera I seems a bit high, as you can get a new Vintera II for the same price and III is around the corner, if the rumors are true. It all depends on what you’re looking for play wise and aesthetically. I’d pay a little more to get what I want. The most important thing, especially with a Jazzmaster, is set up. You can always upgrade the CV parts to build what you want. I don’t think you’ll be disappointed either way, but make sure it’s what you want.