Terrible. Do NOT use Supliful unless you want to deal with complaints and refunds. They say they ship in 2-5 days unless it's the first time printing your label which could take longer (It takes 2-3 weeks at best), but the normal shipping to your customers also takes 2-3 weeks. Absolute trash company.
A golden idea aiming 3 massive birds with one stone. Ecommerce + print on demand + fitness! No large investments and Product inventory is a big plus 1. Expecting big things from Supliful!