I ran my CS-590 for several hours yesterday. What a great saw. A little grumpy on the first start but she fired up on the first pull every time thereafter. Mine is muffler modded with a 20" bar and it cuts like a laser. I used to run a 50cc saw for firewood and man this is so much faster.
As for 590 vs 620p, most people wouldn't notice the difference. As stated above, don't buy a 590 with the intention of turning it into a 620 because you will be wasting money. Now if a part breaks, I would absolutely buy the 620 version. I had to replace my clutch cover. A brand new complete 620 version cost me $35 and now I have the captive bar nuts, which is a nice feature.
Pictured below is the Timberwolf with it's CS400 little brother.
As for 590 vs 620p, most people wouldn't notice the difference. As stated above, don't buy a 590 with the intention of turning it into a 620 because you will be wasting money. Now if a part breaks, I would absolutely buy the 620 version. I had to replace my clutch cover. A brand new complete 620 version cost me $35 and now I have the captive bar nuts, which is a nice feature.
Pictured below is the Timberwolf with it's CS400 little brother.