Stability of 4-ho-mipt fumarate salt

What experiences have folk had with the fumarate salt of miprocin (4-ho-mipt)?

I've found plenty of information on the hydrochloride salt and other forms but have a curiousity about the fumarate salt, all I've found says that it lasts longer and does not have hydroscopic properties but specifically wonder how many have kept it in solution (whether h2o or alcohol or a mixture) and for how long it lasted and the potency.

Thank you for sharing.