Stephenson bags are one of the finest down systems on the market. Wiggys is my personal choice in synthetics. Repeating the oft listed pros and cons, down is the finest insulator, bar none. On the negative side, it takes time to regain loft after compression, rapidly loses insulation with the accumulation of body oils,dirt,sweat and frost buildup and requires carefull cleaning. Down will also lose all insulating value wet. I think this fear is overrated. Unless total immersion in a major accident is possible, just try to soak a down bag. The quality units have very good materials that make washing one a wrestling match. Wiggys bags have drawn considerable debate and some controversy in the outdoor market. I personally have always been satisfied with mine. They are somewhat larger and heavier than other brands and some critique the construction and finish as relatively crude. After living one season inside a traditional canvas cowboy bedroll my unit feels like a feather and fits like a Saville Row suit. I love the ability to toss mine in a washer. Mummy bags can feel claustrophobic versus hunter, or square bags. This is a personal choice really. The standard Wiggy mummy has plenty of room and extra footroom for the odd bits of gear you need to protect or keep warm. I personally don't use bivys. It seems like a lot of effort to essentialy pack a tent without any room. I don't have any favourites in 2 man tents. I've crawled into several styles and brands over the years and they all worked well. I think just about anything that isn't labeled the "Hillary Everest Mountain tent," made in Red China and sold at SEARS will do well ( My mother actually brought this abomination home from her sales job. <img src="images/graemlins/blush.gif" alt="" />)