Remortgage - this is a good deal?

Hi,

My mortgage is due to expire with Santander in April - been with for 3 years and on 5.99% fix at £825 per month

I borrowed 138 and i have 132 outstanding.

I think a fair valuation of my property is 170,000 (being conservative)

I have quickly put some details into £ comparison site and its found what i think a good deal with the Co-Op/Britannia

On a loan of 132,000 - they offer 3.89% deal thats fee free (well there is a £70 land registry fee) fixed for 5 years at £655 a month based on a 27 year term

It doesnt appear to be portable and has a tiered early repayment charge but i dont see us moving in the near too distant future anyway so i dont think this will be a problem

This sounds a good deal.

But this is my first time remortgaging so im not really 100% sure.

What do u guys think?

Thanks