Some with the longest history have not had the best record, partly because for a long time, there were not a lot of users. Accusine was one of the first, but had a lot of issues in the filed and now they are owned by Schneider, who may or may not have fixed the problems (I never gave them another chance).
I have been using TCI (Trans Coil Inc.) for about 8 years now, I find their products and support to be excellent. Others in my company have used Metsa and Schaffner, I hear they are OK but I have no direct experience because once I find someone to work with, I tend to stay there unless (or until) they screw up.
" We are all here on earth to help others; what on earth the others are here for I don't know." -- W. H. Auden