I have used both.
I bought the Rockman for the same reason, so I could play anytime, anywhere, to enjoy my own loud music, without bothering anyone else, even on a roadtrip in the backseat...
Clip it on your belt, plug in the guitar, put on the headphones, adjust the volume and effects, and jam!
My preference: If you have a practice amp with a headphone jack, I'd recommend Sennheiser Wireless headphones, which I also use (with a Wireless Guitar System, without having cables to trip over)!
I bought 2 pairs, and have 1 recharging base plugged into the TV upstairs, and 1 recharging base plugged into the mixing board downstairs.
They're tuneable for different channels, I just dial 1 channel to watch TV/movies at night, and dial another channel plugged into my mixer for my keyboards/guitar/CD's/concert DVD's/electronic drums/FM stereo, etc.!
They were $60/pr. at the Dell computer website, a few years ago, they're definitely the best headphones I've ever owned, for the value!
Let me know what you end up with, either way!