The AR620s are pretty solid receivers. I know there are people who have a love/hate relationship with them because they're antenna-less, but I've not had a problem with them yet.
Lemon RX receivers, I really like. They've been rock solid for me, and i use one in my Nano Goblin that I like to fly at a pretty decent speed out at my field.
Orange receivers - I've had mixed results. VERY mixed results. I've had one cut in and out on me during a combat event, causing my wing to crash prematurely from a light bump, whereas others were going just fine.
I've also been told that, when i bought them, "Oh, sure! These are DSMX!" That's what HobbyKing had them listed as - and as HobbyKing is the only authorized retailer of Orange receivers, I tended to believe it. When I got the first batch of them, I could only get them to bind with DSM2, the older, 2 channel max binding. I only paid $5/receiver for these things, so i wasn't too upset, but once I lost the last one in a good crash, I decided not to go back to them (also because they ONLY seem to carry them in the Hong Kong shipping warehouse, and now that COVID-19 has really stopped us up from getting products quickly from China, I've kind of stepped back from the HobbyKing products - I would rather pay a little more than wait for months, AND get better reliability.