Custom ground camshaft, low power

I was thinking about buying some 1.6 roller rockers from 440 source.

These ones,
http://store.440source.com/Aluminum-Roller-Rockers_shafts-16-Ratio-New/productinfo/200-1046/

Cant beat $300. I've always had luck with 440source in the past. Has anyone used these particular rockers before?