Welcome, Diabolical.
I got a 5020 about a year ago, mainly as backup heavy artillery for my pursuits of firewooding and storm cleanup. Found out it could keep up with a Husqy 455r- not bad for $100 less than a 455r refurb. And ... it works great for noodling- really spits the chips clear.
After about 15 tanks, it's still loosening up- a good sign to me about expected longevity.
(You can find good prices on non-pro Husqy refurbs at vminnovations dot com- prices include shipping.)
Probs noted so far:
1) air filter seal not-so-good away from the spring clip. Tiny bead of silicone fixed it. I clean filter in place.
2) fuel line in tank softened at filter, releasing same, with saw sucking wind. Snipped off 1/8" of fuel line for temp fix- easy fix in the field. Soon to be replaced with some .160" - .180" Tygon fuel line. Gotta wonder why they use the cheap vinyl? crap. Don't tell me.
3) I wish the oil pump was driven off the clutch as in my 455r. Would spray less on starting a cut.