I operate a string of ~60 local businesses that have physical storefronts.
On average each store has 5 local competitors.
Our customers are VERY price sensitive - they will almost always call the "lowest price" guy in the area first.
As a result we currently have a duct-tape system to monitor competitor pricing and tweak ours as fast as possible.
MonitorBook would be a potentially much simpler mechanism to orchestrate this.
If the MB team is reading this drop me a line and we'd be a potentially great case study / early adopter.
Things that would have to work to make this usable long-term:
a) API so we could pull this data into our pricing algo.
b) Clear error-checking confidence - if a site we're monitoring changes their code / display and we miss it, we'd have to go back to duct-tape which is sloppy and labor intensive, but reliable.