Which REL sub, R528 or B2


I'm planning to buy a REL subwoofer. It will be used in audio system mainly, but also in HT from time to time. I listen to jazz, vocals, occasionally rock. It will support Dynaudio C1. I'm considering the new R528 or B2 ( can get them at roughly the same price).
The new 528 looks better but is it as good as B2?
jkuc
I use a REL B1 with my Sonus faber Cremona Auditors M and it has no problem keeping up with these very fine monitors. Speed is not the issue; integration is, and nobody does it better than REL. I tried Velodyne and JL in my home on trial and decided that the B1 was the best choice for my setup.
It is about timing and response. This is the most important part for any subwoofer. Paradigm can maybe go low, but this does not say anything about the speed in response. Integration with the speakers is the main thing. This sets a subwoofer to a higher level.
Timing and response as well as "speed" are utterly useless when used in a conversation about subs in any context other than discussing the design of a sound system for 100,000 listeners spread over acres at a festival. Bo's relentless nonesense insults the intelligence of experienced hifi freaks and spellcheck designers, along with displaying a sadly inadequate and misguided sense of musical taste...otherwise it's all good.
I've ended up with B2. Looks better then the black cube, 528. A matter of taste. I haven't had a chance to compare them sonically. Perfectly integrates with the system.