Got this to go with my Aspire Mixx and it fits, looks and works well on it. A great tank with great flavour, for me the 3ml extension glass was essential as I use higher VG liquids and need that extra volume (4.2ml is available but you lose the metal 'cage' round the glass). Since I lean more to DTL vaping I didn't like the 1.6 coil, but the 0.7 is good, and I've found the 0.4 coils are even better (actually intended for the Nautilus 2S but they fit this), probably lasts a week or more of daytime vaping (even with 70%+ VG), I use something else most evenings.
Love the convenience of the top filling. The only issue I have is that when unscrewing the top fill, if you're not careful you can also unscrew the top cap with it, this loosens the seal on the glass and liquid can leak out the bottom - so highly recommended tank overall, just be careful when filling and you'll be fine!!