I've been working with it for a number of years now and have been red for a really long time. Just good stuff. And the minuses are acceptable by ease of use and quality. This step from large to small transmitter microphones is fantastic. I don't use that old one anymore.
(INTERNAL) MIC
With camjo filming I can also quickly mic someone (unplanned person) without a lavalier because it has an internal mic. Can the lavalier stay on the original speaker and do I just pin the red one on the new person. Ideal. Do you have better sound than the cameramic.
You can also turn a mic on and off via the receiver. Super handy. You don't have to walk up to the person to turn it off and on. Also useful when filming with the iPhone because you can't pull audio apart there. So if you're mic'ing someone you can turn them off until that person has to speak. Pay attention to this because sometimes a mic can be off without the intention. Sorry about your recordings.
LIGHT AND SMALL pros & cons
It is also light and small so on dresses no longer a problem. However, people run away even faster because of this. So always pay extra attention. Clamp does not hold well on thick fabric. I have tried magnets from Rode, but I lose them every time. Walk past a steel pole or handrail, door handle and it's gone. I once had 6 pieces... now only 1..
And because it is small, it is also less strong than the old reds. That's why I often place it at the front instead of behind because that can sometimes cause malfunctions. But because it is small, it is often easy to hide, in jackets under shirts, under headscarves. Ideal.
MAGNET
Be careful with large magnets. I was standing next to a construction machine that turned out to have a mega magnet. Caused a lot of glitches. But later in the day at another location the malfunctions continued, hence a new set.
FAULT
And in 1 set the button to turn on has become lame due to almost daily use.
LEVELS
The newer version has something clear how much you adjust the gb level instead of that triangle.
Hope this helps you make a choice :)