Hi,
I had a "The Mouse BT" for over a year. I remember being very enamored by the pictures of it online and also being very disappointed when I opened the box and saw how cheaply made it was. Because I had spent so much money on it, I tried to convince myself that it was great mouse, and even told others so. But, after using it for a year, I realized how big of an idiot I was. It ate batteries like a three-year old eats chocolate, its tracking was absolutely awful, and I agree with adk that it felt extremely cheap in my hand.
So the hunt was on for a new mouse. I ended up going back to a wired mouse for my iBook. I got the Mighty Mouse from Apple. Yes, I paid a lot for a wired mouse, but I have rarely been disappointed with a product from Apple, and I do really enjoy the Mighty Mouse. I don't think I will go back to a Bluetooth mouse unless it had good battery life and used Bluetooth 2.0 + EDR to help hedge the latency issues with a lot of wireless mice.
My $.02