I saw an old thread from 2015 on here about PJT products. People seemed to like them back then, do you still like the newer versions? 

The PHT products are all amazing. I've honestly used them on myself probably more than on my horses.  I love them. 

Do they run small in sizing?

Yes, follow their specific instructions on how to measure. My horses that wear 78 & 80 in normal blankets wear 84 & 86 in PHT 

Hmm...when I measure with the tape I get a 76 but I usually get 78 in winter blankets...but I like the winter blankets to be kind of long.

Everybody has their preferences.  I much prefer BOT products.  Had MagnaCu & saw absolutely no difference in my horses.  

This has been my experience as well. I didn't notice any benefit for my horses with PHT, but BOT is extremely beneficial in certain situations.