Yes, that is what i was referring to. As for the TZX/CASDuino, i don't know - there are already android apps like MSX2CAS that can play these files, is there really a point to having a dedicated device for it?
IMHO no... but people might have different priorities.
All the PC/Android software are lacking REM signal. This has been discussed in another thread previously; I'd summarize the REM issue as following: While not mandatory for most software, there does exist some cassette software where the user needs to be at the computer, and ready to press pause. Considering the price, I'm not a fan of CASDuinos (I'd recommend to just go for something which emulates HDDs or floppies instead), however, some just like to load from an emulated cassette...
However, there is one good point to the device in the first message: it looks cool as ...! 
EDIT: IIRC the CASDuino does have REM support with the right kind of cable, but obviously other the device(s) in this thread do not.