I have an 8 year old CDT40 - cracking machine. It's one of the affected ones. Been offered a TDWSF83BEP (like you, can't find anything regarding this apart from a few bad reviews), but we've also been offered a IDCE8450BH - which to me seems a better choice. Seems to still be selling, and with great reviews. The issue is a slight design flaw that Whirlpool have noticed when they took over Hotpoint. As long as you keep your dust filters clean you should be safe anyway as the issue seems to be idiots not cleaning the filters.
Personally, the way I'm looking at it is my current machine is old. Even after their "mod", stuff will start to go wrong with it. For £99 I get a new machine, which will "hopefully" last as long. That to me is a bargain. It's cheaper than a single repair cost should anything go wrong, and it's a brand new modern up to date, more efficient machine.