I have a set on a Vintera II and to be honest the tension is fine, I didn't have to adjust the Truss rod after swapping out the stock strings,
they do however sound a lot thinner than the Ernie Ball flats I have on my Squier CV, but that has a Fender Pure vinatge 62 pup installed, so it could well be
that making the difference, I'm not sure what the stock pup in the Vintera is.
If it helps I tried one of these along with a CV 70's, with the block inlays, back in 2014. They didn't feel really any different, though, as Jono said, the pup was brighter in the MF. I opted for the CV, but wish I'd gone with the MF, as the CV later developed a rattle within the neck.
I have a CV 70's with the same hi mass I swapped it out for a Hosco vintage bridge, all holes lined up perfectly except one of the outer ones, but I found I could still get the screw in and irlt was fine. Hope this helps.
I recently made a purchase on here via bank transfer, everything went as smoothly as I'd expected.
I've had no problems whatsoever with any transactions with fellow BCer's over my 14 years on board.
Though I have read about some despicable goings on that have happened to others.
I think all you can do is check sellers/buyers feedback and go with your gut feelings.