I bought one at my local Mercury dealer and installed it last weekend. $225.
Short summary: I really like it! I was delighted it would work on my 2007 Bennington (2006 engine)
Installation is simple.
I think newer boats (at least the high-end ones) come with dashboard versions of this, so maybe its just for those of us with older boats - or simpler boats.
Its not totally intuitive, but I'm learning it.
You can set up several screens with data you want to monitor.
I customized two screens to show 1) Boat Performance (speed, fuel GPH, fuel remaining, etc) and 2) Engine Performance (RPM, oil temp & pressure, coolant temp, voltage). There's a base screen (non-customizable I think) but I can't remember exactly what's on it - RPM, Gallons remaining, and something else)
Things I like (after all of two hours using it last weekend):
- True RPM
- Easy to see GPS speed
- Fuel flow rate (this will get your attention up at WOT!)
- Gallons remaining (based on estimated flow rate)
- Hours to empty
- Ability to log maintenance - and it will prompt for next required maintenance
- Tracking of fuel use over time if you input how many gallons you put in every time you fill up. I think this will then give more data on GPH and GPM as it builds a database - but I haven't had a chance to build a database.
- Maintenance logs have a space for comments (so I put in price, etc)
- Verification (or not!) of onboard gauges: oil pressure, coolant temperature, voltage.
- It also shows oil temperature (at least on mine), which is not on the dashboard.
- Fault alerts with details.
- It may show faults for sensor options you don't have (in my case seawater temp and steering angle) but you can block them so they don't show. Its a one-time thing.
Things I don't like:
- Its not particularly intuitive, and the instructions are minimal at best.
- When your phone is not bluetooth connected to the module, you can't see much (i.e., what screens had been set up, performance history, etc). This data is supposed to be stored in the cloud, so maybe I just haven't figured it out yet.
- It allows 4 engines to be monitored. I only have one. It default named it "Starboard Engine". That bugs me (I'm anal...). Let me name my own engine!
- The maintenance logging is limited. For example, it has one for "inspect spark plugs", but not "replace spark plugs".
- Doesn't seem that there are any warnings for potential problems like high temperature, oil pressure etc. This would be a nice backup to the audible alarm.
Things I have questions about:
- Why are the hours showing on my boat's tachometer hour-meter (185 hours) different from what the Vesselview showed as soon as it hooked into the system (205 hours)?
- It is supposed to be able to capture "Peak Speed" (and possibly other "Peak" data). Not sure how this works, but I was hoping it was automatic. When I'm at WOT and tweaking the trim, I don't want to be focusing on having to push a button on my phone. Again, I'm on a learning curve here...
Things I haven't used yet:
- Moment captures: you can take photos and tag them with GPS, log in where you caught a fish and it will show on the map - same with obstructions.
- Log your favorite Mercury dealer... (don't have one yet!) -- and it will send him your fault readings if you have a problem and call him.
Other stuff:
- It gave me a Fault warning that the fuel level sensor isn't working properly ("input circuit is above valid limit"). I knew that, thank you. But I can get a visual on my tank by opening the back seat, and with the new gallons-remaining and gallons-to-empty on vesselview, I doubt I'll bother fixing it (pending future verification of accuracy)
- It gave me a Fault warning that the pitot sensor isn't working ("input circuit is below valid limit"). My MPH were pretty close to the GPS, so I'm not worried about this. Anyway, its very easy to know when I'm going too fast - I just look over at my wife!

- Also gave a fault warning that the drive trim position sensor is not working properly ("input circuit is above valid limit"). Seems to be fine, so not sure what that's about.
- Sure would have been interesting to see what fault it generated when my plugs were bad (just fixed by local Mercury dealer)
For those of us with older engines, this is really helpful.
Oh yeah... it told me my engine was out of warranty! Duh!