I have a set of relatively cheap Travel Trak rollers from Performance Bike. I'm fine with them, never tried the parabolic. I personally like rollers over the turbo as I don't like having the bike in a fixed position.

What I did starting out was put a chair on either side of the rollers. Started pedaling with one hand on a chair, one on the bars and practice taking my hand off the chair every now and then. Took me about an hour total between two days (30 min each) before I was comfortable riding with my hands fully on the bars. I have ridden off the rollers 3 or so times, but I keep a chair on one side to catch myself. A wall bench or counter would serve the same purpose. Parabolic rollers might help with keeping you centered, there are other rollers that have inline skate wheels setup to keep you fro riding off as well.

Typically I'd setup my iPad on a stand in front of me to watch Netflix until I got my power meter. Now I will hop on Zwift, which works fine with rollers and a PM. If you have/get aluminum rollers, you can add additional resistance with an array of magnets placed about 1-2mm from one of the drums. I can get 600-700W out of mine doing this with a magnetic broom.