I've also had a relatively poor experience with Tesmanian. Ordered 4 things from them, and have had issues with 3 of the orders. In the past year, I've done 2 chargebacks total among all of my business and personal expenses, and they were both for Tesmanian. Ugh.
Order 1: "Glass" Screen Protector. It was not glass. It was cheap plastic junk. Tried to return. They kept insisting it's glass, so I sent them a video of it, and haven't gotten a reply since. Had to do a chargeback.
Order 2: Cancelled order in their system within 5 minutes of placing (to buy something else instead), got automatic cancellation confirmation email, but they took the money and I still haven't gotten the refund 14 days later. Had to do a chargeback.
Order 3: Ordered an individual mat, and then ended up ordering the full mat set and asked if it was possible they just remove that individual mat I already paid for from my kit so they wouldn't have to accept a return, and there would be no additional shipping. They said sure no problem. Haven't heard back since. If they had said sorry we can't do that, I would have just taken the hit on it, but why tell me no problem and then not do it?
Order 4: Full Mat Set. It's taken a while but it's finally getting delivered today. I am hoping it fits well and is good quality as I've heard issues with recent MY and 3rd party mats.