Having worked with TradeGecko a lot through customers, you guys seem like a good option for anyone on Stitch currently (And yes, I enjoy your API so much more than the Stitch API).
Also, we're focused on SMB omni-channel product based businesses, we're not as focused on super-high volume DTC brands -- Skubana is a good option if that's your business profile.
We’ve got an open API and a sales channel SDK, happy to see if we can help.
Cameron at tradegecko dot com