MB Quart seems to be pretty good so far. I was asking the same question on these forums not long ago and someone informed me that MB Quart's stuff was pretty waterproof. I haven't submerged my kick pods yet so not sure how waterproof it really is. I like to drive through water, so waterproof was a must for me.
Installation is meant for a dealer application though. I'm pretty savvy with these kinds of things and the install was pretty challenging for me even. I think the main reason was because the system I bought was compatible with so many different machines and came with numberous extra harnesses that weren't needed in my specific installation but some parts of the instruction manual are misleading in the sense that it doesn't always break down what isn't required for your specific application..they just assume a dealer is reading them, or someone who's very proficient.
The system sounds awesome though. I was worried because I have Ride Command and the setup I bought connected with the Ride Command unit via RCA which I know isn't the best quality (at least in home theater it's not). But I was impressed at the quality for sure.
In summary, I'd recommend MB Quart DIY kits if you're pretty savvy, don't mind a challenge, or plan to pay a dealer to install. The sound is great quality and the manufacturer claims to be pretty waterproof.