Retail Microsoft Dynamics GP Point of Sale Systems (POS)

What retail point of sale (POS), retail store, till Systems are compatible with and also work well with Microsoft Dynamics GP?

On my investigation, the market seems to be sparse with only a few products out there:

Compass POS- seems to get the most praise and most mentions

Salespad POS – very experienced in Dynamics GP

Retail Edge – reports of the product being integrated successfully with GP

Microsoft Dynamics Retail Management System (RMS) (as good as retired not worth looking at)

 

If you know of any others, please leave me a comment and I will add them to the list.