Shimo is with mugen now.
Judging by the look of the car (R4) it looks like a great car, and being the newest car after the triple RRR. I really can't believe the R4 is a POS. my RRR just got shelfed after 1full season. Only shelved it cause I was the only one still racing it a my home track. I moved on to a NT1, the RRR just worked on any and every track I've been to. My NT1 is just a tank, the quality of parts are second to none. Before I bought the Xray I was really set on the R4 even with all the negative posts about it I just couldn't believe it was a worse car than the RRR. Anyway the car looks good but the price is way too high and not having a pro in their camp just doesn't make sense.
Either stick with your RRR or go Xray.
IMO the designer of the RRR is now working with hot bodies and the R10 has some real close similarities to the RRR just modernized. And the Km Hk1 would be the closest to a new RRR