What internet service did you have before signing up to now?
Personally I would stick with now, and go down the use own kit solution.
Unless things have changed then the price point of now can't be beat, and with it being budget a few corners are cut , one being the use of an old router model that's not that good.
If you are thinking of switching to a more expensive ISP work out how much more that would cost you over 12 months vs buying your own router.
The are a few things to try with the now router to improve things such as separating the wig bands, and location.
