I used TC when I moved to the USA last month. It was cheaper to use their holiday charter return ticket than an RPT one way...
TC are strict about carry on bag weight*. They weigh the carry on & will require you to repack into your hold bag(s). I observed a number of people doing it at the counter instead of going elsewhere, repacking then returning while others check in.
End result: a slower throughput of pax. check ins.
*NB: They also have a low baggage weight allowance ~20kg so pack light!