Well, about EXR-55:

64 poliphony is great (I think) for this level or price, and USB, COVER, orchestator, melody intelligence (18 types!), are interesting things too.

But what about Mb for sounds?.
Technical data don't refer how many Mb, only say it has 8 times more wave memory than the EM-25.
But EM-25 had 1 Mb!!!!
So, it seems EXR-5 has 8 Mb.

But it has: 510 panel voices, 542 XG lite, 256 GM2, 20 drums sets. And a very good stereo voice!!, Roland said.
All of this in 8 Mb?
Which is the Roland's secret?