At 460 grams (1.01 lbs), it is 200 grams (0.44 lbs) heavier than the EF-M 55-200, but you get the 18-200mm range.
Will be interesting to see how the reviews stack up between the two.
p.s. I wonder if we'll see anything from Tamron at the other end of the range soon.
For me, the convenience of one lens outweighs (forgive the pun) other aspects such as weight but it cannot be ignored. The allure of this smaller form factor is size and weight, although the Tamron comes in at 459g whereas the EF-S Canon is 595g.
I just noticed that B+H have the new Tamron listed at $499 on pre-order whereas the similar lens for Sony E-Mount is $739. The weight is the same at 459g and so is the filter size at 62mm. Anyone know why the Sony version is so much more? Marketshare in the segment perhaps?