I found the percussion function really easy to use, actually! It just took a few seconds to get comfortable with the vibrations and I was able to customize them to suit my needs during different parts of pregnancy. One tip I picked up from reading reviews before buying was to use it on a surface instead of directly on your skin - it made all the difference in getting good contact and coverage.
As for other products, I had already been using a heated pad for my back pain during some pregnancies, but this massage roller surpassed that in terms of providing long-lasting relief. The thing I liked best was how easy it was to use throughout full pregnancy - no heating involved, just effortless and gentle vibrations that seemed to target exactly where the soreness was.