I just got around to installing my hard tube today. I haven't done anything with the other intake tubes yet. Other than this and a K&N panel filter, my entire intake is stock. My only other power mod is a Trifecta budget tune. Here are my findings.
I'm sure there's some placebo effect, but I feel a definite improvement in throttle response. The latent surge about a second after hitting the throttle that plagued the car before is virtually gone. I'm not sure if overall power is increased at all, but don't expect much in that area. This is a responsiveness and reliability mod, not a power mod.
The engine is slightly more audible due to the more solid connection between the throttle body and body-mounted MAP sensor assembly. For reference, I would describe NVH from a brand new TTR transmission mount as moderately intrusive and NVH from the hard charge tube is slightly audible.
Overall, this is a great product and well worth the current $75 price, IMO. Keep up the great work, DDM.