bought our 7 pod Aerogarden probably 10-12 years ago. My parents like it, so we bought them one, too. After my Dad died, Mom just eats iceberg lettuce (yecckk!)so sent the second one home with me.
We tried tomatoes once, but it wasn't worth the time for the taste and volume. I've tried making my own spinach pods with mixed results. Mostly, we either use one for mixed lettuce, or use both for mixed lettuce starting a few weeks apart. One is getting too big about the time the second is in its prime. We'v grown hers, but end up with more than needed. That's fine in the garden, as they are ornamental as well, but not all over the kitchen cabinet. Now that we have empty bedrooms, we should put them on a card table out of the way. But it is so handy having lettuce two steps from the 'fridge.