The only valid complaint I've seen about this, and it's not an issue for me at all, is that the probes and gateway charts are separate. They are basically treated as separate entities, so if you have two probes, you get three charts (the third being the gateway obviously). I use this with my WSK and I have no trouble with the gateway reading the probes. The only issue I did run into was that a probe didn't seem to fully charge, but I realized later it's because I was being a dope and I didn't scrub off the smoke residue off the exposed ends, and one of the charger contacts connects there. After a little scrub, they're working perfectly. I was able to get 15 hours out of the probes without a recharge.
The only thing I've encountered that blocks the signal of the probes badly is foil. As long as I've had the end of the probe sticking through, no problem at all.
My setup is with the gateway close to the grill and connected to wi-fi. I have monitored things while away from home and that also worked flawlessly.
I think it's a great setup and I have used it for several overnight cooks.
I'm happy to answer any questions you have, and thanks for sharing the sale. Might be time for me to get two more probes! edit: whoops, this time the probes aren't on sale separately like they were when I got my kit.