Grocery store subscriptions for "free" shipping. Do you guys use them?

Walmart (Canada) has started offering subscriptions for "free" shipping for under $10 a month. The cost of gas to go there a few times a month would be more than the subscription fee.

Since I normally bike to get groceries, this isn't really a factor, but the idea of getting groceries shipped over the winter seems like a nice idea.

Does anyone here use these grocery store shipping subscriptions? Is it worth strategically getting it for a few months out of the year?