Stripes is pretty good it depends on what you need.
I know that the online store for waitrose (uk supermarket)
WaitroseDeliver : Homepage
I haven't personally used it in anger but I have done a couple of spike solutions with it when investigating the correct technologies for several clients and it does seem to be pretty quick to pick up.
I have certainly found it useful for spikes as by sticking to the simple conventions you can avoid quite a bit of config like you would have to do in, say struts.
The best thing I would suggest is setup a really simple web app and have a play with it. That's the best way to find out if it feels right for the solution you are trying to provide.