I used PRO1 on an Ultimate S3 during my time at university. It is stiffer than normal PLA and very easy to print because of low warping and high layer adhesion. The drawbacks in comparison to ABS:
- no smoothing with Acetone
- a lot less heat resistant
Horses for courses.
About two or three years ago I was told by a Ultimaker sales guy that they were going to change the supplier of their Tough PLA to BASF. At that time I wondered how they would do it because their Though PLA was even stronger than PRO1 but a bit less nice to print, so the switch would have changed some material properties considerably. I guess their own Tough PLA answers this question finally.