My problem with it (and many of the other alternatives) is not having an associated Asset Store. Not that I have an overarching need to buy stuff, but because there is a curated place where I can find a model or prop I need that will (almost always) import properly and work and scale the way I expect. Yes, you can scour the internet for "free" 3d stuff, but as often as not it's worth what you paid for it, and unless you're running the program it was created in you will spend more than a little time getting it to behave.

My .02 worth as a casual indie developer.