I think the real thing holding the rotrex back from claiming a significant place among the options people consider is the lack of hard evidence to miata owners of what kind of power this thing could produce given proper sustaining mods. Cueball said this as well; the guys on here are not interested in 6 psi - that is like the default wastegate setting for a base kit that everyone immediately puts a boost controller on and never run it that low...
I get 6 psi at 2.9k rpm or so, I'm sure if I turned my boost down to 6 psi I'd see that same type of torque curve as that dyno... what could impress people is how quickly it can get to 12 or 14 psi - but we haven't really been shown that yet.
The beefy torque curve, reliability, and low heat all add up to what I see as being the hands down superior boost option for a street miata. I do not want something with a million little elements that need constant monitoring and maintenance on a street car (this is how my car is), and I do not want modest accelleration through the first half of my rpms and then a sudden kick in the pants at 4k for a street car (also how my car is).
For the track this all changes. I don't mind tinkering with a track/autox car - and it's not unreliable, it just requires more monitoring as there are more parts and more heat. And the power band is suddenly perfect - why would one be below 4k rpm on the track? The torque below that is a non-issue in that environment. Given a definitive solution to the manifold bolt issue - and Savington seems to have found one, the turbo seems better for those who want to track their car and those who want higher power levels - it's the well known and proven option - there's just not enough actual evidence and good hard data about what the Rotrex can do at the power levels we care about to make it an option to many here. I know Bellwilliam and Trackdayhookey are using them, but again, there isn't a bunch of publicized info on 949's website about those setups as an example of what it can do, nor of the OGK yet, though you're right Emilio, the OGK, with all its one off parts is not a great example anyways.
It's a crazy reliable setup, of that we are all sure. We just need to see what it can really do. I know there are a lot of other cars who use this supercharger successfully to make good power, but it's not going to mean much to miata owners until there is good evidence, data, and info about this blower on the miata at higher power levels.
I've gotten my girlfriend to agree to getting an NB down the road for street use. I'll be buying a Rotrex kit for it