I have.... 8 different climbing saws now? Ran the T540i for a few years before getting the new T542i and it's the best climbing saw I've ever owned, and my daily driver 90% of the time.
The modest increase in power over the 540i combined with the feedback the clutch gives you makes it so much more capable making larger cuts, and making those cuts safely without risking the auto-cutoff stopping the saw on you in a critical moment.
I only use the 200x battery when climbing, and even in the rear handle on the ground. And use the exact same two year old batteries in the 542s now along with other new ones. By my tastes the 300 battery is WAY too heavy, but if you wanted to buck a bunch of trunk wood in the tree without sending the saw down, you can do that as it has almost twice the amp-hours.
With that free charger/battery deal, I took advantage and got the new top and rear handle, with two more chargers and three more batteries. The 300 battery is relegated to being used in the blower and a backup in the truck. At this point the 540s live in my basement, as backup saws and unless the 542is break and I need something to use in the meantime, that is where they will stay, even though they are great saws as well.
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