Quote from dcraig:
What beta ?
I have been using it to monitor a couple of hundred stocks with my own software. Performance is not bad at all. Sometimes lags a little behind IB feed by not by a lot.
A post on their support forum says that they are upgrading their server infrastructure and will be notifying current subscribers of improvements in the near future.
The whole arrangement is much more developer friendly than some of the crap supplied by other vendors.
The beta is for a paid service they are developing. This is part of the improvements.