Best Cheaper alternative I have tried
4 stars because while they cost a fortune, I've never had any issue with the actual sonicare replacement heads. These have been by far the best 3rd party heads I have found. The only issue is that they are a little tight on the fit so make sure to push them all the way on and they may look a little off center. I assume it has to do with the manufacturing so maybe another person might get a perfect fit or someone might get a looser fit. I will say all 4 I have tried out and all of them were the same tightness, so I would assume a good fit or tight fit over a loose fit.
Rating: 4 stars