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Yeah at that price I would.
I don't think it'll make any difference to your decision, but as an FYI if you add more, while you can generally mix and match, the first/master(?) router needs to be the highest model out of them.
But tbh we found 2 x M4 was enough for a 3 bed semi so I'm sure 3 will be plenty.
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We've got three in our four bed, three-storey house with two adults working from home and a teenager and pre-teen who use the internet a lot. They've been rock solid; really impressed with their performance, the easy to do a firmware update and the coverage. When we had the loft converted I thought I might need to add more, but so far so good.
£90 for three is a great price.
I had Deco M4 and now have M5. I upgraded to M5 because they were a bit smaller and I planned to put one somewhere that needed to be smaller (I still haven't actually got round to putting it). They go a bit further down the garden and are obviously a bit smaller, but no noticeable difference otherwise.
My experience of the Decos with a Virgin "super" hub has been great. I think the app UI is also pretty good - things like prioritising devices like our work laptops, and hopefully some restrictions when are kids are Internet age.
Generally I didn't have an issue with the form factor of the M4 - which is the same as the E4. And think they look nice enough.