My Gortex Sidis were wearing out so I went shopping last week and bought some Alpinestars Gortex Touring boots. Sheer magic! very plain boots but soooooo comfortable. They also have thick soles which helps me when riding as I am a short ar*e

The rubber is also different to the Sidis in that it is a little softer and grips the floor much better.
They were not cheap (£170) but worth it.
Worth a look if you are in the market for a pair of boots.