All in all, a good product.
I've been using the bell for about a month now and am happy with the purchase.
The bell is a bit cheap in construction but good for the price. It is of the classic lever action type with a nice dring-ring sound rather than the single ping of other bells. I wanted something that made a bit more noise than just "ping" for use when commuting and for that it works well. It was very easy to fit and went on my mountain bike handlebars no problem.
A few minor problems: Initially it did take a little bit of adjusting before the ring resonated properly - some WD40 to free up the lever motion and lifting up the cap slightly made a huge difference. The cap does come off completely if you pull it up too hard, but is easily put back again, and despite being in London, no-one has walked off with it yet... Additionally the rain does seem to get in easily (I store my bike outside when at home) and I noticed that the spring inside is showing some signs of rust, but, again given how cheap it is, this doesn't bother me too much.
If you are looking for a simple, low cost but classic sounding bell then I would recomend this one!