I have been using the Fieldpiece SMAN3 for almost 3 years now. I decided to see what the Hilmor craze is all about. I paid $460 for a set with Temp clamps but no hoses. Add a set of YJ hoses... $570. I am so far happy with the ruggedness of the Hilmor set. In my opinion, the SMAN4 has a few key features (aside from the wireless capabilities) that set it apart from the Hilmor set...
SMAN4 has high/low alarms for pulling vacuums. This will allow multi-tasking and accuracy of the vacuum while unattended.
SMAN4 has ability to calculate target superheat.
SMAN4 micron gauge reads "stbl" when delta P is less than 10 microns/min.
Hilmor shows saturation temp, line temp, and superheat/subcool simultaneously
Hilmor temp clamps are better quality
Hilmor feels more rugged, knobs are bigger, unit housing is more durable.
* Dont be fooled* : The so called "analogue" gauges are ELECTRICAL not MECHANICAL. This means that the digital pressure sensor reads the pressure as an input and then a servo motor turns the dial on the "analogue" gauge face. Hilmor's "twice the confidence" slogan and "digital and analogue guys can agree..." is less than accurate. If the electrical pressure sensor fails then the "analogue" gauge fails. It does not feel like real mechanical gauge. The digital/analogue gauge has a degree of "flutter"!
Hope this is helpful to any prospective digital gauge guys.