I got 3 free STB rentals for life as a Shaw winback. I told them that I used to have 3 feeds with the classic MTS TV and needed to have that and they agreed.
Also, I got Basic + 11 themes for some reason, even though they only told me I'd get 9.
Finally, my dad is an existing classic TV customer and kept getting offers from Shaw as well as lousy offers from MTS for Ultimate TV. He called MTS, asked for retention and told them Shaw was a better offer. He ended up with 2 free STB and free PVR for life, free HD starter for 1 year, free install, discounted TV (for 6 months I think), and discounted internet because Shaw was offering 15Mbps.
I think MTS really needs customers to support all the infrastructure they are rolling out, so they are willing to give a lot to get people to sign up.