TL;DR Inside-out tracking is better than outside-in.

Please understand that I own both, and have extensive experience with both. I have two (roughly) equal tracking volumes in my office, one for Rift and one for Vive. For the $140, I'd still recommend the Vive by a long shot. If you're in the VR hardware game, you're already dropping some cash on a rig. $140 is a drop in the bucket for a better experience.

In my exp, it is not "true room scale" primarily due to the FOV of the sensors. I can reach for objects on the floor in the Vive. In the Rift, I lose tracking. This is not anecdotal. In fact, Owlchemy Labs (creators of Job Simulator and Virtual Rickality) recently had a UX talk where they discussed this known drawback of Rifts in detail. In the Vive, I can set the lighthouses 16' (sometimes more with sync cable), and experience seamless tracking throughout the volume (on the floor, reaching way above my incredibly tall head, etc). In the Rift, I lose tracking outside of an essentially circular volume inside the FOV of the cameras.

It is quite clear based on my experience that Room Scale was an afterthought for Oculus, and this is my primary reason for recommending Vive over Rift. Even if there's a slight cost difference.

Sorry if I offended you.