I've been beta testing the SuiteTalk REST Web Services, and it's been interesting. They're much easier to work with than the traditional SOAP-based services, and the metadata support is a nice feature. However, while I know the REST services are still in beta, and my testing has been against a Release Preview, they do seem a little slow. For example, getting a Contact record, based on an internal ID, can take anywhere from 1 second to as long as 8 seconds. Compare that to a RESTlet that's essentially doing the same thing and returning data in ~ 700ms. In any case, it's nice to see them modernizing SuiteTalk.