Ok.
After spending some time with the Mynd Play, I can only really echo Bruno in saying it is a fun toy. Basically the unit itself works fine, but the software is arguably far too basic for what a meditator is looking for (which actually is a bit of a grey area in my case, pardon the pun). I was hoping that the new 'pro' software would be the new standard software, but it has been launched as an additional 35 pound purchase, making the whole thing pretty pricey.
The 'pro' software only really brings it up to the basic type of info you might expect to be seeing (session times, and graphs) but doesn't have anything particularly detailed in the amplitude readings, basically the graphs are OK, but really basic.
The hard thing is to work out what it is you want it to do, which is what i said the the vendor; it works, and it's graphs do show the differences between sessions, but it has no flexibility so if you want manipulate the data, you can't. Which leads me back to wondering what I'm looking at and wanting to compare it in a spreadsheet, work out means and standard deviations etc, get a clearer picture than 'that squiggly line is bigger than that one'
The reality is this particular company is more geared towards entertainment rather than research/meditation so it wouldn't be fair to say it fails as a product, I rather failed to see that is where the marketing is pointed too. Note the extra large word "Entertainment" on the home page; http://www.myndplay.com/ -can't say I wasn't told!
If you are thinking of doing some personal research with EEG you will be quickly wanting more detail from the data. The upside is the headset itself is apparently compatible with the neurosky software and potentially other 3rd party developers, so if it really does get your juices flowing, the headset is fine and is definately comfy enough, though it is a bit too small for my extra large head

Edit: i too would be interested in the software hack you put together Bruno, that little beep could be my ticket out of here...