Hi Michele.
I am hesitant. First of all because of the ethical issues, and I just noticed they have 16 (!) trackers on their website. One problem with non-humane tech is that everyone keeps using it (see: I was wrong about Google and Facebook: There is nothing wrong with them).
Am of the opinion that we should give a good example here, and select a more ethical HT candidate, even if that means we do not have the best features. In that case our orders help support them. If they are really good HT-wise we could even consider donating (some of) the ‘profits’ - if there are any - to them and forge a really good partnership relation, get sponsorships/rebates later on.
PS. I saw one of our members post 2 other candidates, but then deleting the message. They were Printful and Printify and I added them to the wiki post.