I just got the 733 off amazon too. Well, I'm on a third already in three weeks (haven't used them, just tested them).
First one - channel 1 and 2 were off by 4 degrees. Even after swapping the probes the same channels were off. Also, the lcd of the receiver was very dim when looking straight at it, would look better looking at a down angle to it.
Second one - Returned the first, and ordered another through a different amazon supplier. Channels read dead on but the screen had same problem. Thought I could live with it but ... Left the batteries in for 1 week with the unit off. Turn it back on and the screen was definitely dimmer, it had drained the batteries when off.
Third one - Returned second one and ordered a third from same amazon seller. This one the channels are dead on, screen slightly dim but much better than the others. Keeping batteries in it to see if it drains. Fingers crossed.
I may even just keep the damn thing if I can get one or two cooks out of 2aaa's and just make sure I don't leave the batteries in. The 733 and the 732 are really the only accurate and wireless ones I'm seeing on the market.
Worth mentioning. In case you haven't heard, these probes are sensitive to water and prone to breaking. Lot's of people have suggested red rtv to seal where the wire connects to the probe, then heat shrink over that.