Just installed same unit (but the black version), and so far seems great. Will update as the months go on.
Same as shown here, (or in Part Unlimited/Drag Specialties catalog):
http://www.goldwingcycleparts.com/ecom/product/104/2185/
The difference between something like this and a unit like the Doran are many.
This unit is user serviceable, so simply pop in a $2 CR2032 battery in sensor every couple years instead of spending $40+ (shipped) for Doran non-user serviceable sensors. Cheap version is made by Cosworth (internal circuit board), and no clue as to replacements or interchangeability.
This unit displays temperature as well, and both temperature and pressure seem very accurate. Doran has no temperature readings.
Alarms are adjusted by actual value, not a baseline with percent of change. Hi/Low pressure + Hi temp alarm. Not sure how Doran works, but it does update only every 6 minutes (instantly if a drastic change occurs, I think). This unit seems to update every minute or two, and also instant with loss that exceeds alarm settings. Screen updates regardless of tire motion.
The Doran display is waterproof, while I assume this low cost version is not. I have been using a car non-waterproof TomTom for a few years now on the bike, and never any wet issues, even though we live in a very wet state. Keep a ziplock baggy and velcro within quick reach to cover in the event bad weather hits. I used Velcro for the this cheap TPMS. My cheap alarm system uses a similar remote display, and zero issues after 5 years of using that cheap display.
Buttons on the low cost would not be easy to use with gloves. Doran probably better.
The low cost unit is 100% portable, so can quickly move sensors to a trailer that you might happen to use to haul your bike one time.
The display is portable with good range. I watched my tires air pressure and temperature change last night from my recliner, while bike was in garage 30 feet away.
Biggest issue I have with Doran are the $40 sensors that you must replace when battery fails. Many reports of failure within a year or two, no where close to advertised. And the portability is a plus on the cheap unit. Plus temperature. Looks like a winner to me, as long as it holds up.
This cheap unit will save you at least 25% in initial cost, and perhaps much more over it's life compared to the Doran.
As to added safety? Of course TPMS makes riding MUCH safer.
Running Ride-On in tires here.
Left a RTE, hit the Interstate for 45 minutes, normally cruising at 75 to 90, 2-up.
Stopped at an exit after a short burst of 90+ for a wife bathroom break.
Bike would not go on sidestand.
Rear was almost flat and went flat within a couple minutes.
A drill bit entered tire outside the narrow width the Ride-On protected.
Had we continued another mile or two on the Interstate, it would not have been as lucky results.
TPMS would have alerted us long before safety was an issue.
Of course if a leak is noticed before it goes too low, this will also help save the tire better, as less damage will occur. Saves you money!
Another low cost unit that intrigued me is available at Amazon and elsewhere for a little less.
http://www.amazon.com/Orange-Electronic-P409S-Retrofit-Monitoring/dp/B002DYH586/
Supposed to be a new Motorcycle version out May 1st, P408S.
Even this car version could work for many riders, similar to how a car GPS works on a bike.
As long as the screen is good in bright sunlight.
Replaceable sensors with same issue as Doran, must replace when battery dies.
But seems like excellent support and following..