I liked the first one; it had a simple rock-paper-scissors design scheme and was a pretty, for a late-era PS2 game. I've heard that switching to
RRXX is like trading in a cute, funny, witty girlfriend for a new one who is prettier, but dumber than a bag of hammers. Still, I'll play it if I can find it; it's not like I'm looking for
Oneechanbara X...

Yeah, my impression is that J-region games are locked to J-360s, which are the same as Asia-region 360s. But in contrast, "Asia-region" games are rarely locked to any particular region.
Not like it's particularly easy to find 360 games at ANY retailer around Osaka anyway, but the logic of J-360 is an Asia-360, but J-games are locked and Asia-games are not, it feels like the "Who's on first?" comedy routine to me.