M 40-150mm R for $100 worth it?

iansmith wrote:

I'm looking for a lens to take with me on a trip, something with more zoom than the standard 14-42.

I see the M.Zuiko Digital ED 40-150mm f4.0-5.6 R is on sale for $100 which is quite a bit cheaper than any of the other zooms in that range. 14-150, 18-180, ect. They are all around $500 or more.

Seeing that is is so much cheaper, is there a large quality difference? The 14-150 certainly is more convenient than carrying around multiple lenses but 5 times the price. AM I missing something here.

Link to the sale... it ends in 2 days.

http://www.getolympus.com/us/en/lenses/pen-omd/m-zuiko-digital-ed-40-150mm-f4-0-5-6-r.html

My normal minimal gear is the 14-42 and the Panny 20 pancake.

Thanks!