Running a white label GPS business through GPSWOX for about 2 years now. The reseller portal is clean and the client management tools are solid, I can spin up new client accounts in minutes, and the multi-tenant structure makes it easy to keep everything separated.
Device support for Concox GT06N and Coban TK103 is good out of the box, both connected without much hassle. The tracking accuracy on these devices through GPSWOX is consistent, which matters when my clients are checking in on their own assets.
My main gripe is with mobile app customisation. On the lower white-label tier, the branding options are quite limited, you can't fully remove the default colour scheme or customise the splash screen. I had to upgrade to the next plan tier sooner than I'd planned to get the branded app features my clients expected. That upgrade cost should be factored in if you're planning a reseller business from the start.
Support has been responsive, average ticket reply within 4 hours during business days. ROI has been strong overall; we recouped the annual licence cost within five months. The platform scales reasonably well as I add more clients.