Dang, 14 cups! Makes my 9-cup food processor sound small!
Yeah, the mason jar vacuum attachment is pretty handy. Works for everything...dried fruit, homemade sauces & jams, etc. It's a little tricky to use, but once you get the procedure down it's cake.
Waffles are fun. I like the Belgian flip model because it makes one that is nice & thick and fills up your whole plate - it's a meal by itself! The flip action ensures that it's cooked on both sides. The square model is thinner & works better for when you're using it as part of your meal rather than the whole meal, so if you're doing bacon, eggs, and waffles. Sometimes I do PB-cup waffles using the square ones, same as PB-cup pancakes:
http://forums.anandtech.com/showthread.php?t=20852
The Air Fryer is an interesting beast. I wouldn't call it a fryer at all, personally. Toaster oven with a fan is a better description. Same boat on owning a real one - I don't want to get a deep fryer because I would absolutely die an early death

I had a small Fry Daddy in the past, and it was awesome, but it died an untimely death & hasn't ever been replaced. If I do need to deep-fry anything, I'll usually just use my Wok because the curve is so wide that the oil bubbles do a good job of not overflowing, and it also reheats between batches incredibly fast. Anyway, I'm not ready to recommend the Philips XL quite yet; at some point I'd like to compare it to one of the halogen models (1/3 the price & excellent reviews as well). My brother is thinking about picking one up, so if he does, I'll have a shootout & post it over in the Air Fryer thread.
Yeah, Weck makes great stuff. Also check out Bormioli Rocco, they make neat hermetically-sealed glass jugs (twist-top with an o-ring to seal it up), which are useful for homemade juices & milks:
http://www.amazon.com/Bormioli-Rocco-Frigoverre-Hermetic-Liter/dp/B001JA5CSK
Nut milk bags run about ten bucks on Amazon, super easy to make rice/almond/etc. milks with them & a good blender (you usually soak the nuts or whatever you're using overnight first). You can also use your Instant Pot if you'd like:
http://www.hippressurecooking.com/got-soy-milk-make-it-in-the-pressure-cooker/
If you do a lot of it, they make specific appliances for doing stuff like soymilk - does the grinding & the heating automatically: (heat removes the bitter beany taste)
http://www.amazon.com/SoyaJoy-G4-Maker-Stainless-Inside/dp/B00ALM5ZFM
Yeah, ceramic grills are awesome, but I'm waiting to invest in the good stuff when I get a house at some point so I can make them all built into an island. And I have the same problem...takes awhile to get a good heat going, so I typically only do charcoal on weekends now. Gas is just easier...it took me a long time to accept that, but with my time & energy being more crunched lately, a lot of the times I'll just go outside, light up my Bayou Classic burner, and do a few smashburgers real quick. If you're interested in forced-air heating, check out this DIY foundry on Youtube:
https://www.youtube.com/watch?v=hHD10DjxM1g
My buddy made one (he actually uses it as a foundry), but I thought it'd be a great grilling system too because it gets so dang hot. I was thinking that design would be pretty spiffy linked into the $20 DIY Cob Oven design here:
http://www.theyearofmud.com/2009/09/12/outdoor-cob-pizza-oven/
Right now, I'm working on a homemade 16" pizza oven using a pair of bayou burners. Just got my 18x24" baking stone in, so if the weather holds up, I'll be doing some design testing this weekend!