I use a top handle saw very little in my operation, I have one an old 009 and my son has a 200T. Bought have been extremely reliable, the 009 is literally beat to death, but still runs good when I need it too.
I don't think the average user is at any disadvantage with a clamshell design saw, I had several and had no issues, until I joined here I thought they were a PIA to work on but after THALL's disassembly thread it made it much easier to work on them.
I am not really a Echo fan, but I know that their string trimmers and blowers are excellent equipment. I do believe they have worked hard on improving the performance of their saws. I've had a chance to run I believe it was a 520, it was okay, didn't knock my socks off, but have no idea if it was broke in and thinking back it was prolly on the rich side, a proper tune could have prolly helped it. They may be a excellent saw but the local dealer we have just is adamant that the warranty is worth a hoot. That it takes an act of congress to get a claim apporved and for the dealer to get reimbushed.
No more than I use a top handle, I would have to take a hard look at it if I needed one, just due to the price differential. If I was a climber and used one all the time I would have to go with the 201 and mod it, just because of the relationship with my dealer, I know he would take care of it........period.
Echo's spending some marketing money and trying to stress their products are pro grade, I'm sure you'll prolly see a increase in product in the big box stores, challenging Huskies dominance in that market segment.