I hear what your saying about the costs, but due to my work (and possible changes to it) I need to keep in touch with e-mail etc, and I do use the internet on my phone a fair bit. So for me £25 a month is pretty good for a phone I will make a lot of use of.
Using it for a few days now, it is very, very good. The internet is really amazing, and I find at home, rather than fire the laptop up for a bit of browsing, I'd rather use the phone. It's just big enough to become really useful, almost like a small tablet. I've also noticed that downloads are faster than on my Magic.
It seems very fast, it's got some excellent features, and it even makes phone calls!

The only downside seems to be the battery life, which isn't brilliant, however, for me it isn't much of an issue. I can keep it topped up at work, and if going anywhere for a day, I can always take my battery extender (a USB power pack).