I bought this as I have been diagnosed with a perforated ear drum and can't practice with my normal saxophone for a few weeks and it has been fantastic. Not only can I still practice as if though I am playing my usual sax (except for the embouchre) but I am annoying my neighbours less!
I will definitely be using it even after I have healed to just practice the repetitive things (scales, arpeggios etc) to minimise annoying my neighbours!
The keys feel exactly like a saxophone (maybe a tad stiffer than you might expect, but that can be adjusted supposedly).
The service by thomann was great and the item arrived in the UK really quickly too.