I am truly not "a techie." I've been in SL for 3.5 years and had nothing but enjoyment, until the release of the new viewer, which I consider to be a nightmare in too many ways to list right here. A lot of my friends in SL are in agreement. I don't know of anyone who uses it.
I've been forced, by some of the new skins, and some of the new clothing, to use the viewer 2.1. It says that the SL version must be upgraded to use the product.
I checked the 3rd party viewers, which seem to all be 1.2, so I believe that I'd run into the same problem. Also, I don't begin to know how to go about establishing my SL with a 3rd party.