I have played around with a 543xp for the last couple of weeks , and while I have heard why Husqvarna wants the saw in their lineup I am trying to figure out why Husqvarna wants this saw in their lineup. The saw is lite and handles easy but I find it useless unless you are primarily cutting wood less than three inch diameter. I don't see much of a market for it in my area especially since you could put a few more dollars in and get a lot more versatile saw.
I guess there was a hole in the product portfolio below 50cc for a professional saw, having the typical attribute of a heated handle and carburator as an option. For us this is exactly the saw we are looking for. We've been recently looking at the Stihl MS 241, which now suddenly got this Husqvarna 543XP as a competitor.
We currently are using both a Stihl MS192 (12" & 0.043" gauge PMMC3 ) and a Jonsered CS2152 (13" & 0.050" gauge H30). Our needs are (not in prioritized order):
1) heated handle,
2) take .325" chains for less frequent sharpening needs than PMMC3,
3) less fuel consumption, i.e. larger fuel tank than in MS192 for longer work periods,
4) lighter than the Jonsered CS2152
P.S.
We'll use these saws primarily for removing trees smaller than 80mm diameter = three inch ballpark