A supervisor once said to me "If we locked you in a padded cell with 2 bowling balls you'd probably break one and lose the other". Amazingly I've never broken a French press, even kept a spare around for a long time because it seemed inevitable.
They don't break if you have a spare. I broke my first one (didn't follow directions and used a metal spoon to stir, not plastic). Replace it with 2 and have had both for years.
For the paranoid, they are available in plastic and stainless,.
I use my inverter for the microwave, and tools when necessary. All other 110 appliances (mixer, computer, printer, paper shredder, blender, tv, dvd/vhs cable box and modev and fans)are only used with shore power.
As far as size and type of inverter, all home appliances are 1500 watts or less, and only sensitive electronic devices need pure sine (may include microwave?). Heating elements and motors will do ok with even a square wave ac source.
I do have a Mr Coffee that came with the boat, but have never used it.
I just use the microwave to re-heat food. Wouldn't cook a Costco Lasagna in it at least not without shore power.