I wrote a fairly verbose (sorry) review of the Lifeline rocker plate - top marks from me. Nothing to compare it to other than static riding, but it feels much more natural once you’ve dialled in inflation/offsetting flywheel weight. I’m also one of those people who starts a DIY project, and everything that can go wrong does (AKA fairly inept). Compared to the effort of sourcing materials and DIY, I was happy to pay for the thing to be delivered to my door with very minimal assembly. Plus DIY time is training time. The only real downside as mentioned above is the slightly larger amount of floorspace lost, but you probably weren’t hoarding stuff that close to the bike anyway.
I happily put in 4 hours on my rocker yesterday (TR ride - Longfellow) along with a decent pair of Assos bibs