Depends the track as well. If it is small with many tight corners you will feel the difference. But true, the 5.5msec of the Spectrum is decent fast.

My first TX was a Flysky GT5. The sales guy talked me out of getting a DX5 pro. Wish he didnt. BUT the flysky is not bad either.. use it on my 6.4D but my TLR has the Futaba 4PM+ and its probably overkill for where I am at but I bought it for the telemetry features.

Absolute minimum to race is a futaba 3pv. Much better is a 4pm.

If you already have a DX5 series radio, chances are that it will do you right, and Spektrum has a good assortment of reasonably priced DSMR2 receivers to choose from, depending on your needs.

Now what I’m about to say is likely controversial, but unless you are a World class driver, the DX5 Pro or DX6R are decent radios for racing, and even if you are, you can’t really argue the fact that Dakotah Phend has won quite a few races with those radios. Make of his recent radio change what you will, but to me, it seems clear as day. He switched from the DX6R to the DX5 Pro about a year ago, because that radio was discontinued, there was no follow up to it, and so the DX5 Pro represented the top of the line for the brand. You gotta have your guys running a product you can sell, right?

Now for my $0.02… I suspect that Spektrum is done with surface radios - at least anything that might be intended as a racing radio - and it’s possible that the DX5 Pro has also been (or is in the process of quietly being discontinued. Because of this, Dakotah may have recently been given the go ahead to use whatever radio he wants.

IMHO, it’s a shame, because I have a DX6R and I can’t say that I’ve ever had a problem with it. They also seem to be kicking butt in the Air category, which is obviously where all their R&D money seems to have been going. Either way, it just seems that they’ve never been able to get over the stigma/perception from folks joking about how their radios are junk. As someone who’s used them for 4 years now, I’ve got nothing negative to say about them, other than the fact that I’m disappointed that nothing new has come from them. Of course, I can’t speak for everyone - I’m sure other folks have their legit “horror stories”, but you usually only ever hear of the bad and not enough of the good. That said, it’s a bit long in the tooth, and while I might continue using it for my TLR buggies, I may go back to Futaba for my on road cars.

I went with the nb4 and will always recommend it, if you have to buy a new radio. It feels nice, dual battery, decent screen, and moveable wheel all make it a hit. The low latency makes inputs very instant and feel very connected to the car. I used to use a gt3 and would have to guess during some fast paced turns. Any unexpected bumps and I was in the wall due to lack of time to react. With the nb4 as soon as I react and then the wheel, the car turns. I can react to small unexpected bumps and recover. I doubt I would ever need to upgrade due to speed or features.

DX5 Pro is a solid radio, certainly better than the other ones listed. Change the grip or wheel if it feels too big.