[PONTIAC DUDE]

R & M are right. The weight of the valve contributes to valve bounce which can destroy lifters and cams. Hard to make or pick a spring that will control it without overloaded the cam and lifter plus maintain durability and longevtivity for hi-perfromance use. That's the purpose the the spring rate charts in the catologs. The biggest issues with valve train is the mass. It's been proven way back that the lighter the valve train components the less spring pressure is needed to attain a higher rpm and make more hp with less mass to move.
Titanium valves, titanium retainers, etc.

As far as testing hyd rollers against a hyd grind with similiar profiles. The Pontiac engine building community is a lot smaller then the Chevy and Ford contingincy.
Most of the time, people already have a basic idea as to what they want. From my business and reading what most people are running about 20% of the market would benifit from the current selection of hyd roller profiles available.
The hydraulic roller for Pontiacs is fairly new. Hence very little comparisons out there. Taking an engine and trying different cams for a even more limited market is expensive and time taker. Your investment is sitting there waiting for someone interested in it. Then you have the trouble of trying to keep up with current demands most Pontiac builders have anyway.
Remember that this technology has been in use since 1985 with the SBC & Ford manufactures from the factory. Almost 25 years ago. They haven't looked back.