I'm a wide foot runner, will FitVille shoes suit me?

No idea how wide the inquirer's feet are but I would say that it is a good idea to measure the feet as suggested by FitVille and order according the measurement obtained. That is what I did and was overjoyed with how very comfortable my "size 8 wide shoes" are. Much more so than my other walking and gym shoes made by some of the other well known brands. I am sure you will not be disappointed by your FitVille purchase, and also will welcome the very useful booklet "How to love your feet" which accompanies the order. Hope this helps

Any warrenty or guarrantee

This would depend on where you are purchasing them and what particular regulations apply. I had them shipped from the USA to the UK. Any problems would have required that I ship them back to the USA. For this reason, I purchased shoes from a manufacturer whose shoes I almost exclusively wear and I am very familiar with the quality of the product. Also, I made sure that I selected the correct size, which differs between the USA and the UK. I know the size I need as I have many New Balance shoes (and boxes) which show both sizes.

Are these good for a high insteps?

I don't have a high instep so cannot comment on that. My main problem is sore feet generally due to lack of support. These shoes have helped ease that a bit.