Billet Specialties; Anyone got pulley experience?

I have an insane deal dropping in my lap on this set of pulleys:

I am building a 302 from the block up and needed every bracket and pulley for the front end anyway. Is using this going to snowball into one headache after another, or should I jump all over this? I wouldn't have spent the money to get these retail, but love the way they look. What do the experts think??

Express yourself, don't be cryptic.

Why the opinion? The "why or why not," is what I need from you guys.

I'd do that because:

1. Vintage engineering doesn't do much for me. I'm not hung up on keeping it original. There are plenty of original cars out there for the archeology majors among us.
2. Vintage brackets and pulleys were going to cost me almost $500 and were still going to need blasting and painting.
3. This is a $2300 kit being offered to me at less than the vintage setup because this guy feels he owes me and is trying to do something nice.
4. Everyone is scrapping for every horsepower they can bleed out of these engines; this should be good for 15-20 HP.
5. I do like the look. It's flashier than I would have sought out, but it is the one being offered, so that's what I have to decide on.

I don't have any inclination to run around with my hood propped open, so as long as it's clean, I don't much care what it looks like. I want it to function well, and I'd like to put it together once. Are there any reasons you guys would encourage me to choose one route over the other?

I appreciate your opinions as well as your reasoning. Thanks