Not much different than any other brand of touch screen that I've seen locally, I admit that it's useless in direct sunlight, but I can see the screen perfectly fine standing in the shade of the driver stand or hunched over to create shade putting my back to the sun. Those who are complaining...
I literally LOL'd at this requirement.
I did the crawler thing about 7-8 years ago but I only had a 2ch radio... I lost interest with crawling after I got into competitive racing.
I currently race with the NB4 and have been extremely happy with the results it gives me on the track/podium.
I do have past experience with the Radiolink RC4G but not with the newer RC8X which has been getting rave reviews. My only ding on the RC8X is that it doesn't offer antenna-less Rx's...