Total posts : 45366
With the exception of glitches not related to the transmitter itself, mine has been on 24/7/365 for over 3 years.
Having said that, I recommend perusing the archived discussions on the TH. However, I will reiterate one major issue: They are manufactured with component changes, even in the same model run. It means one batch may perform differently than another. I was lucky to get one, a TH5 (I have 3) which is very good.
Also,an external CB whip antenna alone will not perform as well as the wire antenna which comes with it. If you want to use such a whip, you will need the range extender unit (pricey) which legally falls into its certification, or an equivalent which doesn’t. IMO, certified gear can be a help to stay legal, but is not end all/be all of Part 15 operation.
Welcome and good luck.