Bought a slightly used 337 while I was looking for a 20th Anniv. model and have never regretted it. It replaced (directly) an '89 GTi 16V and I have to say the build quality of the newer car FAR exceeds the old. The North American 337s were built in Brazil, so they do not suffer many of the Mexican GTi problems (windows do not fall out, etc.). Handles incredibly well even in stock configuration. The Audi-sourced brakes and 6-speed make excellent additions.
Recaro seats, reliability, solid road performance in any weather. Cavernous cargo space for a hatch and a real spare tire (even if it isn't a 19"). Monsoon sound system is more than adequate unless you are a pretentious audio snob.
MAF, coolant temp. sensors and coil packs are still weaknesses. The Bosch electrics are not what they used to be, so the MIL is a frequent site. Feels a bit big for a GTi, but at least it still only has 2-doors (real GTis DO NOT HAVE 4-DOORS or automatic transmissions). Tires are expensive.