These are my #2 selling plug wires for SyTys (2nd to Taylor). They seem to do very well. Pros are low resistance, good heat protection, a meaty plug boot (good for grip), and a good crimp design (so you don't pull the terminal out the boot when removing). Cons are (like Eric mentioned) the straight #6 wire.
FWIW, I have a set holding my shelf down as we speak. $52.99. The conflict is that for only $8 more you can get a V8 set (as dubb mentioned) that'll work with factory manifolds, headers, etc.... You'd need some specifics on the V8 set, but they are a little easier for some.
BTW, Moroso released a new line called the Ultra 40 race wires that provide the lowest resistance per ft of any commercial wire (40 ohms - whooda guessed?

). They're as hard to get as hen's teeth right now, but as more sets become available and they start to hit shelves, the price should come down and availability should strenghthen. Just an FYI.
Michael