Re: Ya get what pay fer?
All I can say is this: If you are already hesitant about the price, I would say "don't do it". Spending that kind of money on pups is intended for people who don't mind blowing the dough and then putting them in the drawer for a rainy day when you don't like the tone. It is an unpleasant thought to have buyer's remorse on a $300 set of pickups....I can think of several pedals or used amps (Blues Junior) that would be better suited for that kind of money.
Overall, depending on what type of pickup and tone for which you are searching, the price can have a meaningful impact (i.e. improved for the better) on your tone. From experience, I can say that the Strat Antiquities sound phenomenal compared to the machine wound AII pros. There just seems to be a little extra magic from MJ's/Seymour's hands.
You will have to be the judge of whether the extra price is worth it. Several of us, here, are not afraid to spend lots of money on gear without regard to what happens if we don't like the pickups, amp, etc. I suppose I may be foolish, but I enjoy testing about the "best of the best". It is part of my goal of achieving phenomenal tone!
I hope that is helpful.
Very Best Regards,
Lee Moore