It prints beautifully but failed in a hot car in less than an hour while the identical model in PETG didn't deform at all. I'm terribly disappointed in it.
Edited to add: per Polymaker's suggestion I repeated the print and annealed it at 100C for 30 minutes before testing it again. This time it performed the same as the PETG. The second photo shows the same model/same setting in PETG (far), HT PLA (middle) and annealed HT PLA (closest). I'm satisfied now, as the extra annealing step really isn't that big of a deal.