I have the comp Hydraulic roller cam in the 505" stroked 440.
Only have about 2,000 mile on it though.
Originally tried the cheap CAT 1.7:1 rocker arms, but they were not oiling correctly.
If I spent some $$$ rebuilding them with quality parts, they might be OK, but I just put on 1.6:1 Harlan Sharpe rockers, and on inspection after 1,000+ miles everything looks great. Engine is rev limited to 6,000 RPM, and I really recommend some type of RPM limiter because the valve springs are only 400 lb/in rate (ISKY 8005A)
The hydraulic roller seems to work OK, but is more expensive than a solid roller setup with no real benifit.
This is my only Hydraulic roller cam engine. Now, I just use mild solid roller cams. Spring selection is easier, and don't have to worry as much about the RPM limit. Also, I can't tell any difference in valve train noise. The Hydraulic setup seemed just as loud, but most of what I hear is all the roller components, sounding like a sewing machine. A mild exhaust drowns out any of the engine sounds anyway.