I got a "cheap pro" grinder and it changed my chainsaw activities for the better!
I used to exclusively round file all my chains, touch ups and severely rocked - I lost days, weeks, months filing chains.
No more!
When I want a super duper edge on my chain I will sit down and file it!
Otherwise each and every loop gets ground.
One rough big bite grinding pass to get the gullet cleaned and any damage in the cutter, followed by one or two mild passes up high under the tooth to get that beautiful C I like so much.
I would like to try an entry level Oregon grinder, but my AMA MAXX PRO is currently covering all the basses I care about, which includes grinding Carbide tipped chains.
Oddly enough I find myself utilizing chains that are not Oregon.
I have been running a Carlton and a Husqvarna, both good chains in my book.
The Carlton round files for touch ups in the field very well!