I have the R&D with center bar that lines up w/driveshaft (much like jd)
sits below the bottom of the hull a good 1/2" or so. Works awesome!
My buddy's 201 sits/performs about the same..
I was shopping for JD when I found my R&D.
$100 is a fair price for the good grates..
I believe those 3 perform very similar
I have the worx 201 and ScottS has the Jet dynamics and we didn't notice much difference between the two. The only significant difference was the Jd didn't feel like you put the brakes on as hard when you let off the gas.
When we did the swap, we had identical hulls and engines, rode a full session in the surf, swapped out grates and went right back out for another session.