Well we did try them yesterday evening. Ordered online, everything went smoothly, pizzas arrived promptly.
Good points: swift delivery, good quality bases (both regular and thin), evenly cooked to a nice golden brown and not oily.
Bad points: small choice of vegetarian toppings and terrible choice of ready-to-order veggie pizzas; toppings weren't generous, sauce didn't have much flavour. Supplied with some weird garlicky gunk in a plastic container, with no obvious purpose. Very expensive.
Bottom line: good quality let down by boring toppings and overpriced for the market they're aiming at.
But why don't they do aubergines, courgettes, spinach, egg, etc? To justify £12-ish per pizza you have to be in Pizza Express territory, not leaflet-through-door greasy cheese land.