I have had two, used Echos, one cheap, one free. Not great, but they cut. The 2511t, is a little hornet.
There is an Echo 2511t thread in the Chainsaw subforum.
I have one, stock. My 193t feels like a boat-anchor. My 200t like a tank by comparison.
My take is that in residential tree work, climbing cutting makes up a small % of the day. 10-15% slower cutting (made up numbers) for a small portion of the cutting of the day, which makes up a minority of the day, is worth it for less strain on elbows, wrists, and shoulders.
Ported will rip.
Narrow kerfs are considerably less cutting that 'normal' width kerfs.
A 200T will give you more speed for more speed-sensitive cuts.
Those are rare for me, or I cut it with a different cut (Coos Bay release on a large limb to land it flat, rather than a super fast snap-cut).