MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.
The rigidity is only an issue if you put one (or more) LACK tables under your printer. To eliminate this I put the enclosure on an existing (rigid) table and designed a new MK2S PSU mount which replaces one of the lower leg corners, thereby eliminating the need for the second table.. (Sorry for the shameless self promotion :-P )
Of course you can build bigger and otherwise superior enclosures, but probably not as easily and cheap as this one. And once this outgrows your needs you can always build a better enclosure. I don't agree that this isn't worth building, it's big enough and holds my spools just fine.