I have a Twinpower SWA 10000 and SW12000 - exactly the the same reel bodies. The SWA series (export) has the nasty orange gold livery that some donut at Shimano thought was a good idea
. The SW 12000 looks much nicer.
On the spools Craig, I frequently use a SOM No Limits 16000 spool on both and they handle PE8 GT fishing without issue. The largest GT I have landed on this setup was touching 40 kgs and many 20 kgs +. In my book these are very viable and cheaper alternatives to a Stella 10000.
The 8000, 10000 and 12000 Twinpowers are compatible with Yumeya 12000, SOM 16000, and naturally, Stella 10000 and 8000 spools. The Twinpower 6000 has a different body and is not.