@jcwillia1 &
@Val D. - With Omada, you do need the controller online and reachable to coordinate dynamic elements such as
802.11r/k/v (ie. fast-transition roaming). One of the main reasons for having a centralized product where you have two APs or more is to be able to have stuff like that, that actually works (provided your clients support it, of course), so I think keeping the controller in-play is a good idea. I suggested the OC200 because for fairly low cost you get a purpose-built, discrete box, whose uptime won't be as influenced as it might if running on the average person's PC. If you're skilled enough to ensure it's just as stable on your own infrastructure (always-on & well-managed PC, RPi, VM, etc.) then great, but the OC200 is an option that's more or less guaranteed to work for the average Joe.
An alternative to a discrete controller system would be a product that integrates it into each AP ("embedded controller"), so the separate software or appliance isn't even needed. This drastically simplifies deployment, plus eliminates the single point of dependence/failure, and even adds a level of extra redundancy with an automatic master/slave "team" of APs. Something like
Grandstream GWN. The
GWN7610 is only ~$80 a pop for 3x3 AC Wave 2. I haven't been able to figure out if the underlying hardware is MediaTek or Qualcomm (like Omada), but from what I've read so far it gets similar performance results. Here's a
setup and overview video by Willie Howe. Granted, the product is young, and there's plenty to be optimized on the firmware, but it already appears viable from the various reviews I've seen, and mostly matches Omada, feature-for-feature. Just another option to consider.