Honestly not used yet, but is very similar to name-brand one I've used 3 years now, which is just starting to get tatty. If I get 30 cleanings out of this, that's a dime per, and that ain't bad.
get a 20-something-to-55 lens, and this, and enjoy what's in front of you.
very good lens, takes so much of the work out of framing a distant image, and takes the awkwardness out of getting very close, 'hi, I'm Jim, mind if I take your picture' close, to people in sports, instructional, or entertainment settings. Maybe not the fastest thing out there, but also not the most wallet-draining, either, and really: would you question the results when you got home?