I found that TM are a safe bet providing you leave it alone. The old adage about "letting the magic out" really does apply to the AEGS but the pistols were always solid, albeit a bit light in the hands.
That being said, QC for airsoft has gotten better across the board and now you have companies like CYMA and E&C who are starting to rub shoulders with the more established brands so unless you are looking for something specific that only TM do, it is worth looking at other brands as well IMO.