3 Home broadband is a good deal if you're close to a 5g mast as their 5g gear is quite new. If you're not close to a mast or its 4g only, you'll have the complete opposite experience.
From what I've read, alot of 3 Towers only have a single 1gbit virgin fibre link so you're at mercy to who else is using the same tower. If it's in a area with alot of traffic, you'll probably have pretty crap speeds.
