Good price for a very nice F4 lens. This is the cheapest I've seen it. I've been keeping an eye on this and the Tamron 70 - 180 2.8 for a while, but the Sony better suits my needs.
You need to sign up for the free delivery. I was already a member but the generic code 101702 still worked for $10 off.
George's also have the tele convertors for a good price ATM, price matching them with Sony will give free shipping.
Having used both (and currently only owning the Tamron) - Just get the Tamron.
It's much better than the Sony for the same price.
No IS isn't a deal breaker as you've got IBIS as well as an extra stop of light for times when IS is required.
The Tamron is super crisp, has very fast focusing and an absolute banger lens.
Currently $1657 via Tamron directly via Amazon for the G2 which is a steal. Think I paid ~$1900.