The ZR850 has been replaced by the ZR960. We had good things to say about the ZR850 when it first came out, however:
The Canon ZR850, a solid choice for users who want great video at an affordable price. Using standard MiniDV tapes, the ZR850 is simple, and easy to use, without the extra features or frills you'll find on more expensive (and more complicated) camcorders. The ZR850 is the flagship of Canon's budget camcorder line, and will serve most consumers quite well.