Don't believe all the hype about Rom manager, it works fine never had a single problem with it on my optimus v, intercept(by the way the worst phone ever made...EVER), triumph or my eee pad transformer. i have used almost every menu option and never had an issue.
A. Rom manager black screens newer phones because it installs an incompatible recovery.
B. The roms listed in it for the OV are not only old, and will black screen a newer OV, but were NOT put there by the rom developers. In other words, anyone can put a rom on there regardless if they made it or not. Loaded with spyware, or not.
If you read and research, yes, it can be used relatively safely, but most people who use it are looking for an easy way so they don't have to read about it.
There are PLENTY of horror stories about that program, especially with the OV.
And since you aren't the one having to clean up that mess every time, please don't go telling people that it works fine when in fact it clearly does not.