I bought Amo back in mid September. Had a different vial that I needed to finish researching. I finally used my Amo vial in research. Vial had good vacuum. Peptide was in a few large solid chunks. Took ~5-10 min to dissolve with a chunk on the wall that was stubborn. It finally all dissolved. Injected the RS. RS reported absolutely no burning.
Would I buy Amo again? Unsure. The burning reports are quite scary. But their site is great, prices are decent, they accepted Alibaba Pay, and support was great.