The Michigan seats are one of the long-standing rafting seats. NRS quit selling them a few years ago when they started making their own (like so many products). Unfortunately "their own" aren't the same, way too much padding for me. I'd love the drain hole, but the fit is wrong. I think the NRS seats are made for 12 year old boys butts, but even one very petite woman I know still prefers the Michigan seat. It's great for wedging in and bracing hard against.
So no problems with Michigan, with one exception (plus the wet butt). The NRS bolt pattern is based on Michigan's bolt pattern, but not for the current low back seats. They have 4 bolt patterns on that stupid seat, but none match. Yes, I bought a new low back this year, and I need to make a bracket to make it fit. I believe the mid-back and high back still have the same old bolt pattern (specs on NRS web site). You are showing the low back seat, so if you use a fab'd bracket just keep this in mind.
I am a river, babe - I've got plenty of time, I don't know where I'm going, I'm just following the lines..... - "We are water" by Shaye