Frustrations: needing a spanner to tighten the whole contraption to the tow ball (then having to disassemble the whole thing because you need something in the boot. Needing a padlock to secure it.
Service: haven't needed much but what I did (and this includes my roof racks and associated accessories) the Thule agents have always been happy and able to help me.
Car access: you can easily with a pivot-out-the-way rack.
I've had three bicycle racks in my life: a cheap that that strapped to the back of a hatchback like a backpack. It damaged the car, and likely would have damaged the bikes if I carried more than one. Next was a locally manufactured 2-bike towbar-mounted rack which was over-engineered, agricultural (<all of this I liked) and clumsy AF to use. Bought a Thule 3-bike platform rack a few years ago and it's cured my bike-rack envy. Don't ask me which Thule it is, but it folds flat for storage, clamps onto tow ball, locks with one key, has optional (torque-limited) frame clamp for carbon frame, *can easily get replacement keys for all locks (or new locks), and pivots to get the dog in an out the boot. I paid around R6500 for mine (new, a few years ago after haggling with dealer, but would happily have paid more for it).