I am running an IM 40 gal, and I hate it. It's not an easy tank to work in. It's too small for most moderate sized fish. Mostly it's the depth. I have to empty it half way to move it to make adjustments. It's more work than pleasure.
BUT I have a IM 14 peninsula that I adore. It's on a kitchen cabinate butcher block on wheels, perfect hight, easy to work in. Smaller equipment, smaller water changes.
Currently looking at an IM 20, but they are out of stock.