I order from them all the time. Extremely reliable, but they are more expensive. They have been around since the late 90s, when I first acquired a catalog from them (along with my Maplin catalog, which was one of my most prized possessions back before the internet was a thing).
They are also one of the few places who will send you whatever is in stock immediately, and whatever is delayed later, in other words, they will pay two courier fees. Ideal for parts you need asap.
But I generally try the hobbyist places before I go to them 