The Granberg hand held tool, IMO, is not a substitute for a decent, bench top spinner and breaker. It is OK for occasional use, and nice to have as a field tool. I have one, but would not recommend it for someone making loops off of a roll on a regular basis.
That said, if you can find one of the clearance ones, it might be worth trying for what you describe. You should be able to get your money back on Craig'sList or the Trading Post if you don't like it - low risk investment.
The Granberg Break-N-Mend is made in the USA if than makes a difference.
I order Oregon/Carlton presets and tie straps from Bailey's, usually when I am placing another order. I get STIHL parts from my local STIHL dealer. You can sometimes find chain parts on eBay, or other mail order places.
Philbert