For me I didn't have to drill another big hole under the water line - no existing paddle to tap into. PerfectPass Stargazer was a simple install and maintenance free for the last 7 years.

I don't really care if the GPS speed is spot on to actual speed as long as it is consistent and maintains whatever it's set at. Are we surfing at 10.1 or 10.7? Don't really care as long as the wave looks good and it's reproducible. Same with wake boarding. But it seems to me that we are adjusting speed a little rider by rider anyway with different abilities and who is sitting where when they get back in the boat.

We have yet to experience the loss of signal under a bridge and taking off. I'll have to give that one a try.

Strong river currents will cause you to change surf speeds to accommodate going up or down stream as discussed a couple dozen times before, but not a big deal in my book.