There is nothing that SW4STM32 does that atollic truestudio isn't better at.
This is why I don't trust ST to look after atollic properly.. they already HAD a gcc and eclipse offering that they could do anything with they wanted, and it was mediocre at best.
As for Keil - well, if your company is used to using Keil for STM32 projects, chances are you already needed to use more than M0 parts at some point anyway - so you've needed full Keil already... at worst it comes down to a business decision - "do we buy the license for the software that all our existing codebase is written with? or do we migrate?" but really for any business relying on using keil licenses for free, well, they really should have thought that through before now.
the hugest loss in this situation is anyone (me included) who has non STM32 projects in Atollic. Yeah I can migrate to any other eclipse/GCC, but the point of atollic is it just worked properly. was fast and simple to setup a client or subcontractor with, and it had the option of upgrading to much more powerful features than normal gcc/eclipse if and when it was needed....
The next biggest loss is anyone already using STM32 with atollic... yeah they have a huge bonus now with the full power of atollic available for free, but they are still losing out. Because no way is atollic going to stay state of the art, we already know just how little ST cares about good software. It's going to rot. the only question is how fast.