iPad. Lighter. Hot water heater. Camera. Speakers.
Not necessarily in that order ;)
***
Mmmmm... Okay. Sorry. You got me started on a happy list :D
Ovens, stoves, immersion blenders. Portable fireplaces of many kinds. Power tools. Recoilless rifles, pistols, suppressors. Speakers, amps, & heads. Wax pots & 5 blade razors. Diffusers. Freezers, chest freezers, & plastic. 500-4500 lumen flashlights, surefire ear protection, walkie talkies. Static trapeze, fire poi, crash pads. Elipticals, rowing machines, heavy bags. Tampons, soap, & eye drops (not gadgets, but must haves :p). Copper IUDs, aerosolized inhalers, ampules. D-Rings. Drobo. Sunglasses.
Heated. Toilet. Seats. For real.
ETA... I don't think I've ever considered "favourite" to be singular. Cough. Ahem. That or I'm just shite at following directions. LMAO.