We use Netflix daily, and haven't had any issues with streaming. It's pretty instant and streams fine in HD when available.
As a household we usually do about 400GB a month (although last month was 700GB) and have never had any warnings about over usage or anything.
My only gripe would be the landline audio quality when using the phone. It's not that great. But that doesn't really bother us as we use our mobiles most the time anyway.