Two numbers, one minute, before every order.
Read the two numbers at the top of every vendor page before you order: the deal count and the dispute ratio. A minute here is the most useful minute you will spend.
How many orders the vendor has completed. A high count over time is a vendor the market has watched work. A new account is unproven, so a first order there should be especially small.
The share of orders that ended in a dispute. Low is good, and a rising ratio on recent orders is a warning even on a long history. Finalise-early is locked until a vendor has earned it, and the profile shows their standing.