The platform has been very stable, easy to use for both clients as well have internal users in our back office department at RBC Capital Markets (Canada).
There are no significant problems with this product that I can think of right now but it does what you need without any major issues or complaints from my end so far! It's great having an API available when integrating into other systems such like Market Axess which we do internally here within CMC Canada - they provide us their market data via spotwise through there integration point using MAPI / SOAP calls etc., This makes things much easier than directly pulling out all those trades manually myself!!