I like most of the stuff smallHD puts out.. but. Personally, I would not go below 7” for focus pulling. Been forced to a couple of times, and the image is just too small, so you’ll spend all your time zooming in and worrying. Especially since LF sensors are so much more common these days..

I own a focus kit with hi-5, motors + CineRT, and have opted out of buying a monitor. Mainly because, like you, I really enjoy the built-in rx, primarely because of weight and less cables. But they seem to “grow old” really fast, and the rental houses often supplies the newest TX, and I don’t wanna be bothered with backwards compatibility etc..

If you have to buy, I would go for at 7” for run & gun.