What you get for the money with the "real thing" vs the cheapies like the MASTECH is "fitness for purpose". I have a MS8910 I bought on sale; it DOES DO EVERYTHING they say it'll do... but with some caveats:
1) The tips, while replaceable, are pretty horrible. You have to file them to a usable profile, and by doing that, you remove the gold plating... which means you'r constantly having to polish the contact points with 1200 grit or drag them across a piece of cardboard to get consistent contact.
2) They are SLOW. To the point of uselessness. For diag work, the "AUTO" mode is useless. If you know what you're looking for, you can get better speed by selecting device type... but that defeats the greatest strength of this type of tool.
3) They don't give useful results near as often "in circuit" as the good ones. Again, really kills the value as a diag tool.
The cheapies are good at one thing: sorting loose scavenged components so you can group them in pillboxes for later reuse. They're fast enough OOC that you don't lose your mind using them.
We survived Christmas with the In-Laws... now we're headed up to Cleveland to visit the great-aunt for a few days before the New Year. Well, mostly my wife is "making things happen" while I nurse my 2nd cup of coffee and try to cudgel my brain gently awake...
mnem
Blessings upon you, my wife.