Wilson Sasha 2 Pre owned?

I am now listening to 25 year old Proac Response 3.5 speakers with Audio Research tube electronics.  Great speakers but I'm considering an upgrade.  I really like the Wilson Sabrina but now have a chance to buy pre owned Wilson Sasha 2s in the low 20's. They are about two years old but cosmetically perfect, would include a 3 year warranty from Wilson. Also, there was some kind of resistor upgrade after these speakers were manufactured and the dealer would include the upgrade.  The boxes/crates are not included.  Looking for any advice on whether this seems like a good deal, whether the Sasha 2s would be a big step up from the Proacs and whether the used Sasha2s are a better choice than new Sabrinas (which would cost less).  Have to decide very soon because there are others interested in the Sasha's. Thanks.