You will get mixed replies on the Guru question (or Stoker). I have good uses for them but most of my cooks are without. Peruse the forum, you will see the various schools of thought.
A remote thermometer is another story, I would say it is almost a necessity. It prevents you from constantly opening and closing the lid to check. I like the Oregon Scientific AW-131 because it has good range and good penetration in to the house, and has lasted longer than any Maverick product. The Maverick products are hit or miss on their QC. Their latest product, which several of us really wanted to love, was a POS. The ET 732. It got some good hype and glowing youtube reports, but our results here were awful. Maybe they have fixed the bugs on it by now, do an internet search and find out. And please report back to us what you find out!