Hi MercainCrossfire,
I'm 5'11 and don't have any real issues with the cabin size - I'm long in the body so maybe a little closer to the roof than most - but there's more than enough head room. (and if you are tall .. drop your seat a little further back
I've have also completed some rather long journeys and felt comfortable all the way - the only issue I have had is the pain I get from the constant grin on my face .
I use mine everyday if i can, I get home from work, drop the van off and go for a spin (rain or shine) possibly not good for the environment /nor the resale value of the car - but defo good for my sole ...

I wish you well in your search - and remember 2 keys are best (lol)