I popped into the Finet shop on Saturday. Spoke to the two lads - using their poor english and my even poorer Turkish, supported by Google translate, and was impressed by their responses to my questions, and how flexible they are trying to be. Plus of course their Skyfibernet beating prices, both installation on ongoing monthly fee.
So unless I hear something different or bad about Finet in the next couple of weeks, when my current TTNET contract with notice expires, I'll be changing from my unreliable 16mb TTNET service at 51tl a month plus no need for the rarely used phone line at 29tl a month, to probably a 4 meg finet service that should be OK for HD TV, and if it is not then I might upgrade.