I did a search on this topic and found no relevant thread. So it seemed reasonable to start one.
Are there any suggestions or better still experiences with a particular type of emergency shelter like the SOL products or even a small single/two man tent which can be reasonably carried in a pack?
Tough call. In advocating for fast and light alpine style climbing, Chouinard argued that "Speed is safety" and "if you carry bivi gear, you will [be forced to] use it" because the weight will slow you down.
For general backpacking and hiking, I try to avoid emergency/survival situations ahead of time.
For winter ski touring and winter climbing, it's a tougher call, because a twisted ankle can be deadly.
The broader question for me then becomes what is the plan on a fast and light trip should an injury pin 1 or 2 team members down (while the other(s) seek help)?
Like many climbers in New England, I carry a super light, single use mylar type bivy shelter in my Essentials Kit. I've never used it, don't plan on using it as a trial and pray I never have to. One needs to think about ways to augment it. Pack becomes insulating pad, enough jacket and layering to survive a night, small twig stove for fire (when below tree line). Often on winter day trips with a party of 3 (safest minimum), we'll carry a 20 degree sleeping bag as a part of our community gear to help an injured team member survive the night.
Lowell Skoog (brother of the now deceased photographer, Carl Skoog) originally posted these plans for a Zdarsky tent on usenet back in the 90s.
http://www.alpenglow.org/tech/zdarsky-tent/
I'm begining to think about saving up for a nysil 2 man tarp tent, like the BetaLite. Weight is coming down on these types of shelters. A lot of protection for not so much weight.