Been with Finet for 7 months - first 3 were very mixed and regular down time - then we went back to UK for 2 months and according to friends it was worse than ever. However, it changed hands in February and as we returned I went in and paid my 30 lira (only pay when using - a month at a time) and it has been excellent since late February.
Went off once and we got a text instantly to tell us they were working on it - but - in Turkish and generally you do need to speak some Turkish as hardly any English is spoken!
We get 3 to 3.5 consistently which as we record on filmon and then download and playback from tablet linked to TV - it works well for us.
The new owner's have spent some money on the new shop frontage and clearly they are running the business better than the previous owners and interestingly we seem to be "on" when Ttnet people say they are off