I have the same saw as the joncutter 2500. I bought it on amazon, but it is not labeled joncutter. Farmertec, I believe, just puts the joncutter name on it. If anything, the joncutter 2500 might have had a couple more quality checks than mine. I have used mine as my climbing saw for about 3 years now. It has been a fantastic saw. Light as an echo 2500, and plenty of power for any trimming I do, up to removal of branches up to 8 inches or so. I've used it to section down spars, but by the time you get down to a 12 inch or so spar it's struggling a bit.
I am not a pro. The saw probably only gets used a few times a month. After 3 years of pretty rough use it is still holding up great. Only issue is I've noticed that recently when cold it will sometimes dribble a little fuel when I pump the purge bulb. I haven't tried to track down and fix that yet. For my level of use it has been great.
I'm currently transitioning to an echo 350T for in tree use, just cuz treestuff had a good sale on them. It's a great saw for me, but definitely heavier and more tiring to use in the tree. The 2500 starts with a flick of the wrist, while the echo requires I steady and brace myself better to get a good, strong pull due to larger engine. But echo definitely has more power.
But, not being critical I hope, I question the advisability of routinely holding a piece of wood and cutting with one hand. If a branch is so small and flimsy that it needs to be held to cut, I think it would be much safer to use a hand saw. Not sure what scenarios you encounter, but imo a small, rear handle saw used with both hands is much much safer to use for any situation other than when in the tree.