I have the Rigid R4510 (without the stand). I like it a fair bit, and would probably buy it again, but it definitely has its pros and cons.
Lots of power for what I do (rip 1" thick hard woods, cut small sheet goods, rip thicker pine.)
Seems to be fairly tough
Decent dust port
The blade plate doesn't fit 100% precisely flat on the table, and I don't think it's adjustable - this caused me a little headache on my last project.
The mitre gauge seems to have a lot of play in it, I've yet to adjust this out
Riving knife setup is weird in the lower position, it either needs adjustment or is slightly bent. Not a big fan of it.
Table is a bit short, you need outfeed support - in a small shop (like mine) I find you're always moving junk around to set up the saw. Sigh, no way around it, there's hardly the space for the little saw.
Overall I like the saw, it was a toss up between it and the dewalt. I think I maybe wish I bought the dewalt, but I think I would have come up with the same issues with the throat plate, and definitely would have with the short table.