What are former DSM Tool users switching to?

Six hundred listings is enough that a bad migration can turn into days of cleanup. Better to find the weak spots while you're still testing twenty or thirty products, not after the whole store has moved. Use listings from several suppliers and watch how quickly price and stock changes come through. Also check what happens when a supplier removes an item completely and whether your markup rules stay intact after repeated updates.

The price on the homepage only tells you so much when every service bundles features differently. Two tools can start at roughly the same monthly cost and end up far apart once you choose the plan that actually covers a store your size. You can read about DSM Tool alternatives here: https://easync.io/articles/dsm-tool-ebay-review/ . After that, check whether each service supports the suppliers you already use and whether your listings or settings can be exported if you decide to leave. Look at the cancellation terms separately too, so you know whether you can stop or change plans without getting stuck paying for another billing period.