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This is the one I own. I have used a lot with my Chargriller w/side smoker box. I have never had a issue with it. This model has a higher temp. Capacity for the probes and also longer range. I would recommend this one just because it is the newer and has better upgraded features than the one you mentioned.
From what I have read on this site it sounds like the Mav is a lot more reliable than the BGE thermometer. Maybe that is the problem.
I actually just bought that exact thermometer last week, did my first cook on it last Saturday.Worked fine, had a successful cook. No range issues, although the smoker temp always read hotter than the BGE thermometer.At first, I ran the probe through the daisy wheel so it would be close to the BGE probe on the inside. It always ran about 50 degrees hotter. I figured that the cast iron may have been throwing the reading off.So I put it directly on the grill between the two butts. It was closer but still was about 20 degrees off. I think the bad reading is more due to operator error, so I need to play with it some more.I don't care for the on/off switch being behind the battery cover, but other than that I'm happy with it.