I wrote up a little review shortly after having started using Rozena. I've been using it for a long time now, time to restate things. The following pertains to sheets of Rozena used for 10-16 hours/week in intensive training and matches during about 6 months, which is about 300-400 hours of use.
Rozena is a relatively spin-insensitive rubber. This also seems to entail that it is not always as easy to impart spin with it. This is especially so when pushing.
The short game is fine, but if at some point you seek to deliver a very tight and heavily loaded deep backspin ball, well, that's relatively hard to do and the ball won't be as spinny as with some other rubbers. So, don't do that.
When countering, blocking (actively or passively), or flat hitting, Rozena is extremely dependable. You can just keep going on and on keeping the ball in play if that's what you set out to do. As long as you're in position and manage to stay awake you'll keep going like a machine.
Opening up backspin balls is relatively easy, and the pleasant surprise Rozena brings to the table is a very high level of spin when engaging the sponge. A light brush will be less loaded than (say) with Tenergy 05, but with deep contact the difference isn't that big. Flicks are a bit easier, but might be a little less pressureful than with said T05.
It shines when counterspinning in half position or second position. Again, here Rozena produces massive spin, T05 level, upon deep contact, and has plenty punch to deliver quality of speed too. A high quality counterspinning game is enabled that way. My game has grown in solidity. This is a tradeoff; I also have a spare T05/NanoflexFT48 setup, with which I have higher percentages of both spectacular winners as well as abysmall errors. By now I prefer the certainty of getting in place, hitting the ball in full confidence that I'll bend it onto the table wherever and however I want it to.
After a while you get used to the way Rozena produces spin and incorporate the required deep contact in serving as well. That takes a little extra effort, and it requires a bit more skills. Learning this is a good thing anyway, and once this is mastered you get to play the deception game by way of deeper and shallower contact as well.
My slabs of Rozena are old enough to develop EJ rash in the meantime. They're worn a bit, visually, with a few crumbs breaking away from the edges; Rozena is more prone to breaking up when hitting the table edge or your partner's blade in doubles. I actually have a very little clot broken out when I brushed a ball that just cleared the long table corner, ever so gently grazing that corner. My index finger rest shows discolouration. Yet the rubbers still play pretty much like new; there's ball slippage only when things get all too wet/humid, and not more so now than when new. To I'm not giving in to EJ impulses just now; there's no justification for that.