BACKGROUND:I purchased the basic version of this tire pressure gauge (Accutire MS-4021B Standard Digital Tire Gauge) several years ago and have been using it up until about a month ago (at which time it failed to give me any pressure readings). The problem with the 4021B is that the part of the pressure gauge that mates with the tire (shrader) valve is made of plastic and fails after repeated uses. I had considered purchasing another 4021B gauge as it did perform for several years and is certainly cheaper but ultimately decided to pay for the improved version (4355GB) and see if it was worth the difference.MY EXPERIENCE:There is an immediately apparent build quality difference between these gauges. The 4355GB has more heft, feels more solid and, more importantly, has a metal "coupler". That is, the part of the gauge that mates with the tire valve has a metal housing with brass internals instead of plastic. This alone is enough to justify the price difference and, in my opinion, makes the 4355GB the better purchase. There is one other minor but significant difference between these gauges. That is, the 4355GB has a "pin" on the back of the "coupler" that allows you to release air pressure from the tire if it is overfilled. This was one extremely annoying aspect of the 4021B - anytime I overfilled a tire I was looking for a rock or a screw driver or something to release the air as the gauge had no way to do this. There are some other bells and whistles that don't matter that much but are nice to have (I guess); the coupler rotates independently of the display so you can always have the display facing you, you can program your tire setpoints into the gauge in case you can't be bother to check your door label, it comes in a nice case.The only downside that comes to mind is that it is still ony accurate to 0.5 psi increments (like the 4021B). This isn't an issue for me but if you are really fussy about dialing your tire pressures in then you should probably look at getting something different.FINAL THOUGHTS:Having used both the 4355GB and the 4021B pressure gauges from Accutire. I would recommend purchasing the 4355GB if you intend to use it for many years as the build quality and features provided are a significant improvement over the 4021B.