pgg, you are certainly entitled to your "opinion" and I respect it.
When you get time, would you mind telling me how many Echo chain saws you have owned personally, model numbers, and the procedure(s) that you used to determine their power output compared to other brands in the same cc range?
Here's my opinion, FWIW, we see this sort of crap on occassion, because Echo did have an entire line-up of pathetically "anemic", slow, underpowered saws for decades. Even though they were relatively well built and reliable, they just weren't on par in the cut to most of the offerings from the larger manufacturer's.
When they started using upright P/C's, some were "home-runs" and others were just OK.
I believe they are continuing to go after that market with new offerings.
If you read my comments in the first response, I have owned a LOT of these saws, and provided real/accurate and most importantly UP TO DATE information on them.
A CS-510 is a strong 50cc saw, on par with anything in the market from anyone in that range. I set mine just under 14,000rpm's and it cuts as well as any Stihl or Husqvarna closed port model I've ever ran.
The two CS-670's I owned, were NOT on part with either of my Husqvarna saws in that size range. The CS-6700 is even worse. They do not enjoy high rpms, or like to stay at high rpm's in the cut even when you attempt to lean them out. They do "pull" quite well in the mid-range, and have acceptable power, but not impressive power.
The big CS-800 was also a disappointment for me, pretty good "grunt" saw, but seriously lacking in top end power and performance compared to a Husqvarna Professional saw in that class.
Same deal with the CS-370/400's, very respectable for the cc's, but not overly fast in in chain speed or cutting power.
The CS-440 I owned was a tad better than the 370/400's, but still pretty "weak" for the cc's, at least when compared pound for pound with other saws I've ran in that size range.
I have heard that the Echo 600P and the new CS-680 are much better than previous offerings. It's rumor control at this point for me, as I haven't had the opportunity to run any of them yet.
One must also keep in mind when I put up this information, that I'm pretty much a die hard Husqvarna fan, and have some excellent offerings from them in my line-up. It's not easy for other saws I bring in here to impress me much, as I already run some of the best saws ever produced....once again, IMHO.
I still don't run around with a "closed mind" when it comes to other brands, just because my wifes/cousins/daughters/ex-brother in laws/next door neighbor bought an Echo top handle and smoked the P/C because he was to stupid and/or lazy to pull the limiter caps off and add some fuel to it!.....FWIW....Cliff