The way I've looked at price/convenience with Uther is that, for example, I'm not seeing any testing groups on FPPG for WBS, so would one then have to try to gather a test group, along with the time/headache of organizing it. Many of the other China vendors seem to take a pretty long time shipping, add that time on top of trying to find testing.
I received my Uther order very quickly and there was already a testing group in place for what I ordered (MOTS-C), in addition to that he's been doing his own and they're coming in high and very consistent, and matching up with the 3rd party tests. Tirz 30 is $40 more than WBS, but a testing group would be at least that much per person, or much more individually, but we're talking $4 per vial more for Uther. SSA's Sema is $30 less than Uther, and from another person I know, they take a long time to ship.