I have seen and used almost every single commercially available micron gauge. Bluevac and JB(69075) do well and so does Inficon. All of them loose accuracy over time and none of them can accurately measure the full range from Atmosphere to deep vacuum. The only gauges that accurately and reliably measure the full range for extended periods of use are the big money bench top ones for lab use and they wouldn't survive in the field.
What you need to know about whatever gauge you use is this. What is the actual range of the sensor? Commercial micron gauges have sensors designed to start reading vacuum only under a certain level. That level could be 20,000 microns 15,000 micron 5,000 micron or even as low as 1,500 microns. Everything the gauge shows you above that is only an estimate and not based on the sensors designed capabilities. If your not sure where you gauge sensors range is, contact the manufacturer or their rep. This piece of information is crucial to using any micron gauge.
My recommendation is to pick the most appealing one based on price, range and specified accuracy and then do everything you can to ensure a tight and isolated system when you evacuate. Always put the micron gauge as far away from the pump as possible and isolate the pump from the system and gauge for a true reading of depth.