He's got a good point. Dyno results are soooo misleading, and are a favorite tool for salesmen. Different dyno's typically read differently. And even the same dyno will give different results from the same machine on a cold, damp day then a hot, dry day. There's also so much loss in the drive train on a Rhino (or other Side X Side). Consider the crank output on a 660 is 40, and rear wheel is only 23 or so (there's a lot of variance between identical Rhinos).
Now add to that, the output characteristics are so important on a machine that weighs in around 1100 pounds (stock). I've seen machines that show 10 or more extra horsepower over another machine, but end up being slower in real life use because the power is coming through in the wrong place, or is 'peaky' and not good use through a CVT tranny.
Now I will give in that a machine that reads 23 on one dyno, versus another machine that's clocking in at 45 on a different dyno is most probably going to be slower. But when different peices parts or different kits are showing results in the ballpark (say 10 horse or so) I'd be cautious to bet my next paycheck on the results in real life driving. Then again, my paychecks aren't really gambling that much so I guess the risk might be worth it.