We will be going to Defender this week to help friends who are outfitting a new-to -them boat and we will be going with Quantum. The tech has been around for a bit, it's just RM is a bit late to the game. Panbo is a great resource (Ben Ellison) has reviewed other solid state offerings so you can get an idea as to how works. The pros are the low draw, instant on and much lower radiation for those who have the dome installed near the cockpit. The wifi is not something I would rely on permanently.
The big benefit is much greater detail and accuracy in close proximity to the boat . The tradeoff is less long range capability. RM says that in rain you can expect around 6 miles for a 24 mile radome. In my opinion, I would greatly prefer strong returns near the boat in lieu of long range for a sailboat.
Since my Radar is relatively new, it's not worth swapping out a perfectly good radar, but if I needed a new setup, this or another solid state unit would be a no brainer--especially since they aren't charging a premium over the current Digital units....