Hide the shipping estimator if only free shipping?

Hi. I'd like to hide the shipping estimator on the shopping cart if the customer has picked a "Always Free Shipping" product (I only have one) ONLY. Obviously if they have other products, then the estimator should display.

I've considered the option of allowing other shipping choices, but I think it would confuse the customers in this case.

Has anyone done this?

This will tell you how many products_always_free_shipping are set to 1 and the quantity:
$_SESSION['cart']->in_cart_check('product_is_always_free_shipping')

You could validate that against the count of items in the cart:
$_SESSION['cart']->count_contents()

NOTE: this is not ruling out Virtual or Downloads ...

Replying from my other account now - This worked perfectly. Quick compare and away I go. Thanks Ajeh! I wouldn't have known where to start.