I am talking about the flex post paid plans. They are contract free and you can quit anytime. You can't cancel and deactivate them on your iPad, though. You have to contact Rogers, which sucks. I really wish Rogers would just give out per-authorised SIMs for LTE. Signing up on the iPad and managing your account from Settings is much better for the customer.
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Personally, I would never buy an iPad without the cellular connection. I want to use my iPad everywhere and hate being tethered to Wifi hotspots.
As for using the Wifi hotspot on my iPhone, I would find it very annoying to loose the battery life on my iPhone from hosting the connection. Also, since the iPhone suspends the connection after a period of inactivity, that would mean everytime I want to use my iPad I would need to dig out my iPhone and reinstalling the hotspot to host the connection.
For me, the extra $130 is nothing compared to the constant inconveniences I mentioned above. I love having my iPad's Internet connection just work all the time.