Just for a bit of non biased opinion, most people here know me, I have driven this car (HPI34T) on it's current tune.
I can tell you that it is a very fun car to drive. Yes it does have a high boost threshold but I wouldn't call it laggy. It does come on like a lightswitch and that's part of what makes it so much fun.
I'm not saying it's the quickest car out there, and most people know I am a hopeless drag racer, but in terms of fun factor, it's got it.
He does have the rev limit raised to 8k which definitely helps because 1st and 2nd gears would be useless without the extra 1000rpm. 3rd gear is the most fun although the most likely to get you into trouble with the law of course. It's kind of like each gears burst of acceleration being a small but very tasty lolly whereas my car is more like a really tasty steak.