Most likely DECA would be a better solution because the powerline adapters can have problems with inconsistent latency/jitter. Really unless you have twisted pair cabling running back to a switch (not a router w/ LAN ports), DECA will provide better performance.
I just haven't seen any reviews mention performance improvements of MRV. We have no problems now other than fast forwarding being slow/not as smooth... but I didn't know if this was normal behavior under the best of setups (HR22-HR23700 Powerline Networked vs HR24-HR24 DECA) or if all we'd get was better general performance from the receivers.
...then show the improvement performances to my wife, and use that as ammo to order a 2nd
If improvements are negligible though, may just wait for now. We use MRV a lot, that's the only reason I am asking, improvement there would be nice but dont know if fast forwarding is any better with a 2x HR24 DECA setup or not.
If I've read other posts correctly though, if i use a HR24 non-DECA, it disables MRV? That would mean we'll never upgrade unless we do them both.