MtnTechwrote a review of Arc'teryx Theta SV Bib - Men's on December 6, 2012
Familiarity: I've put it through the wringer
Overall I have been very pleased with my Arc'teryx Theta SV Bibs, and have considered purchasing a second pair for when the day comes that my first pair needs to be retired.
Activities: I have used these bibs for many mountaineering trips, ice climbing trips, and countless days of skiing.
Fit: I love the fit of the bibs. I am 155 lbs., 5'-9" tall and have a 30" waist, and 30" inseam. I bought a size medium, and have found the fit to be great.
Function: There are many aspects of these bibs that I really like. One of those features are the full length side zips, which I often partially zip down from the top when looking for extra ventilation. The built in gaiters are also very effective at helping keep snow out.
Waterproofness/breathability: I've tried various types waterproof material, and have not found a product that does a better job keeping the water out while also being breathable than Gore-Tex. The fact that these bibs are made with Gore's most durable and rugged waterproof breathable fabric (Gore-Tex Pro), makes these bibs very capable to withstand the hard ware-and-tear I expose them to.
Durability: I have had these bibs for over 3 years, and they still perform like they did when they were new. Just remember that like any Gore-Tex waterproof fabric, it does need to be maintained properly (i.e. cleaned and treated with DWR).
Construction: Superb, which is consistent with any other Arc'teryx product I've seen or owned.
These are a great pair of bibs that whether it is a bitter cold day of ice climbing, or a warm spring day of skiing, they are my go-to shell.
As a disclaimer, I am a "Gore MountainTech" and test products for Gore.