Had the newer version for about 3 weeks to replace coil push’d pikes on a prophet. I had reservations about the 15mm vs 20mm but they are very stiff and hold a line through rough downhill very well with no unnerving deflections. No issues with bottoming out on compressions. Lock down is useful but I only bother on long fire roads or tarmac. All the adjustments actually seem to do something, and now I’ve got them set up as I want I doubt I’ll use them again. First time I’ve used air forks and the weight saving is a revelation, which I haven’t tried so can’t compare. Like having a new bike.
HTH