I'd personally ask for the 'bad' nozzles back, install them into your car and see what happens. You might be pleasantly surprised.
I'd also be surprised if he put them in as-is and the car wouldn't run decently or better, but that doesn't entirely mean they'd actually be "right". See my explanation below...
This would most likely put a end to all the bickering whether you actually need damn balancing in the first place.
Doubtful... this kind of bickering is about like "which engine oil is the best for my _____ vehicle".
Can someone just screw a set of new nozzles onto random used injector bodies, put them in their car, get it to start, and drive it that way? Apparently so.
Is that the right way to do it? Some apparently say yes, some say hell no.
I have a set of bosios I installed with out pop testing with over 250k miles on them. They are just now starting to act up readings are a little off.
Trying to be "thrifty" in my early TDI days I bought a used "complete set" of "ready to go" injectors/nozzles off the forums, they were listed by a seller as cleaned/balanced injector set with new PP520 nozzles, fully tested...
Who physically installed the nozzles onto the injectors and whether they were actually tested, I don't know.
I put them in, the car idled horribly. The Group 13 was all over the place.
I put the stock set back in, life was normal again...
So I sent these "ready to go" injectors/nozzles off to get tested, the tester explained that some random individual (the seller) had "improperly" installed a set of new nozzles on injectors without proper shimming, among other problems.
The tester was able to salvage the situation for me, fix all of the problems and ship them back to me very quickly.
Once they arrived I eagerly installed them but once the engine finally started again with these installed the car had an obvious miss.
Swapping them one by one and trying to start it each time I narrowed the problem down to the #3 injector, installed the #3 stock injector with the other three upgraded ones installed and to my surprise the car idled perfect and drove normally with three PP520's and the one stock #3 injector/nozzle in it!!!
Since I needed the car for my long freeway work commute I opted to put the other three factory injectors/nozzles back in and send the entire upgraded set back for more testing to find out what was wrong with its' #3...
This time the tester found that the #3 nozzle tip had become jammed with a tiny metal sliver stuck in the tip which the tester said likely came off a line nut or pump head thread during installation.
He fixed the problem, made sure they were all correct again, returned them to me (along with the tiny metal sliver), I put them all in again, and the car ran fine, so much stronger than stock...
About 6k miles later that car got totalled so I pulled them out and moved them over to my replacement TDI when I got it home and I've put 32k more miles on it/them since then...
I have no idea how many miles were on these injectors when the seller put the PP520 nozzles on them so I have no idea how many miles are on the injectors themselves at this point but the car still runs fine...
I can't say who's right and wrong in this thread as this argument is yet another "camp A" vs "camp B" TDI vendors debate but my point is, just because the car seems to "run fine" with a set of nozzles in it doesn't mean they're working properly.
Notice I'm not bashing the seller who sold me the set that ultimately cost me hundreds more than if I'd just bought new ones with a swap arrangement, nor am I saying that F or K is right or wrong.
I have TDI friends who really like Kerma and I've personally dealt with both DBW and Franko6 several times so far for several different things, and it's never been cheap but I'm totally satisfied with the results I've gotten from both.
So pick a camp, make a purchase, install the parts, and decide for yourself.