A big ahoy to all my old, and new, forum friends! I was 'on vacation' addicted to another game *gasp!* 
(Oblivion), but have come back to SH3 and obviously found a lot of changes!
I have GWX 1.3, SH3 Cmdr 2.7 and have some questions about updating v. not updating, so please bear with me while I act like a noob! The GWX 2.1 FAQ says: ii. delete the \my documents\SH3 folder. GWX v2.0 is incompatible with non-GWX save games and is likely incompatible with games saved under previous GWX versions.
I have heavily modded my SH3 with a lot of my own modifications and am not looking forward to re-doing everything after a clean install. Plus the caveat that my GWX 1.3 saves may not work with GWX 2.1 further complicates things.
That being said, I might be happy sticking with v1.3, unless 2.1 is such a dramatic upgrade that I can't live without it. I also just bought SH4, so my sub gaming will probably be divided among the two (besides that fact that my life has gotten busier lately).
If I do decide to stick with GWX 1.3 there's a glitch that I've encountered that bugs me and I'd like to know if there's a fix (or is the fix v2.1?). That is: sometimes when I'm being pursued by an enemy ship (it's happened with a torpedo boat and a destroyer) the ship will just run in circles instead of the usual zig-zagging type of searching - really takes away from the realism. Is there a fix? Or should I just 'bite the bullet' and reinstall with GWX 2.1? :hmm: -- Fräulein Kapitän