Well everybody seems to be going into orgasm about these trains but lets see what the refurb is like and how well they work in practice, when I travel on an HST these yes they are more comfortable than most newer stock in many ways but I see a clapped old train that's past its use by date whatever the refurbishment inside, then there is the re engineering of the doors, re engineering of old trains seems to be having mixed results of late. I guess the fact that there are 2 power cars should help and the engines are only mid life but I doubt they will last 20 years as some people suggest and the next franchise will more than likely need to look for a replacement which going to be a very heavy loading with the majority of Scotrail's Sprinters coming up for renewal as well.
As an aside I have always found Scotrail 170's reasonably comfortable but just lacking in capacity in some cases while the benefit of replacing 15+ year old trains with 40+ year old ones remains to be seen.