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All the time, Pentland Ferries are quicker and cheaper (to Orkney - don't serve Shetland) https://www.pentlandferries.co.uk/ A damn sight more comfortable and less spew-inducing than Serco's floating bricks. The book, https://www.amazon.co.uk/Pentland-Hero-Roy-N-Pedersen/dp/1841588881 about their boss's creation of the route is great. It includes a stinging critique of the cozy relationship between the Scottish "Government" (the one that thought up the crazy Named Person scheme and who think that Independence is a magic bullet and will solve all woes - like, er, Brexit is a magic bullet and solves all woes?) and the big ferry companies. A good read of itself, anyway, if you're "for" the little man.