In my experience, the Philips Sonicare Sensitive Brush Heads are very comfortable for daily use. The brush heads are soft, which is noticeably better for sensitive gums. The bristles flex smoothly and don't irritate when I brush too hard.
The fit on my Sonicare handle is perfect; it clicks securely into place and doesn't loosen. Brushing feels thorough without being painful. When flossing between my teeth, it effectively removes debris without feeling any sharp edges.
I also appreciate that they feel durable: after a few weeks of use, the bristles still look well-groomed and don't spread out immediately.
Overall, the HX6052/87s are recommended if you're looking for soft brush heads that clean your teeth without irritating your mouth. They're worth the price for sensitive users.