In reply to afx22:
I definitely prefer these to the Regulus. Even though they both have 4.2mm rubber, I found that the TN Pro to feel stiffer and it has stayed stiffer for longer.
I also thought that the Regulus' bagged out quite a bit and I've not found this with the TN Pros. The heel has been slightly less slippy than the Regulus too.
Overall they are a very similar shoe, so if you liked the Regulus then you'll like these.
Post edited at 13:41