Money is always an issue. If you can get accurate, repeatable readings for less money, then one should look at all the options available.
You can easily spend over $1,000 on infrared thermometers and do the same thing with a contact probe for far less.
I use the Fluke 52 and have two pipe probes. I clamp both probes on every time and leave them on until I'm finished with the job. I always monitor subcooling and superheat regardless of the type of metering valve. With this setup, I monitor exactly what's going on with the charge on both lines throughout the entire charging process. With the IR, you have to sit there and shoot the target whenever you want a reading and this ties up one hand.
Yes, I believe 100% one needs professional tools to do a professional job and I love gadgets as much as the next guy. But, the KISS method will always pay off in the long run.