Fantastic Outer Shell
The Zeta LT has been a great outer shell, protecting me so far on my London cycle commute and a South Downs hike.
Layers very effectively, with sufficient space for a midlayer without appearing too bulky in the process. Sleeve lengths are good and can fit over bulkier gloves. Pockets are well placed and the zips have been watertight so far (no ultra-heavy downpours yet). The C-Knit is really nice to wear.
Only con is the hood may be too small for some (doesn't fit easily over a helmet if you're tall like me).
Most positive surprise is the breathability - noticeably better than my old Columbia Omnitech shell. In fact, it will require a mid layer all winter as the cold gets in (but not the wind).
Would definitely recommend.