Both my husband and I have purchased the T3. He has been fine with his from the word go, I have had a few issues mostly with the brakes and my ability to use them (I have a dodgy left wrist to add to the dodgy left leg I acquire at the beginning of this year). I ended up fitting different brake blocks and cyclo-cross levers to my T3 which has helped considerably and both of us have pannier racks on it for commuting. We purchased them for the sole reason of not wanting to have to worry about where they were locked up - for him at work on an unsecure site, and for me at college. We have had to change the tyres after his rear perished at around 750 miles of use, but otherwise they have been good cheap bikes and do what we need.
How long they will last is another matter; we tend to put quite a few miles on them each week, use them regardless of the weather and live down a single track road which is covered in mud, so mudguards, for us, are essential, though the bikes still need washing down each and everytime we do the track. We have not regretted getting them.