Sure, $1500 isn't exactly "cheap" on the wallet. But then again, neither is a quality table saw.
Don't mistake this for a $10k or $50k industrial machine. And don't get too riled up by the people who seemed to expect that kind of machine for one that's mainly open source with few proprietary parts.
Did you buy a fully assembled 3d printer, or did you buy a parts kit to build at home? If you built your own machine, you probably know how picky machines built on extrusions/makerslide, v-wheels, and pulleys are.
I don't have experience with aluminum, but for a $1500 machine - considering the features and a free basic software package that does decent things -- you absolutely can't find another machine at this price point that is going to be exponentially better.
This is a pretty darn good design, with a community that works together to make all our machines better - some of which obviously paved the way for the new upgrades annoucned today.