Had a five day cruise on LotG in April last year, from Inverness to Oban. We were incredibly lucky with the weather, and the Highlands of Scotland were looking their absolute best.
We travelled to Inverness by train, and were met at the station by a coach which transferred us to the ship. (The same coach and driver were to follow us and take us on excursions at the various stops over the next few days.) On arrival at the ship we were met by Brian, the cruise director, purser, Maitre d', and just about everything else. The ship is small, holding just 54 passengers, but is the maximum size that can fit through the locks in the Caledonian Canal. The main public room is the combined lounge and bar on the upper deck, with large windows to view the passing scenery. The dining room is one deck below. Tea and excellent coffee are freely available in the lounge. Open deck space is plentiful for the number of passengers.
Meals are single sitting at a set time, and you are free to choose your table companions in tables for four or six. The food is excellent, using often local produce. Beware, the waiter will offer to pour you glasses of wine, but each glass is recorded and added to your bar bill (though not extortionate).
We were in a category 3 cabin (the most expensive) and it was not large by cruise ship standards, though perfectly adequate for a short cruise. The beds were very comfortable.
The most interesting bit was the passage through the Caledonian Canal, and in good weather this is simply exquisite. There are several flights of locks to pass through, and this adds to the interest. Excursions were arranged to various places of interest on the trip, such as Glenfinnan, Duart and Torosay Castles, and these were included in the price of the cruise. Brian was always on hand to answer any questions, and to assist with any problems. On our cruise we found that most people were early bedders, and my wife and I often found we were the last in the bar.
Overall we found it an excellent experience, not super-luxurious but very comfortable and enjoyable. The crew went about their duties in an unobtrusive manner, though it was possible to chat to the captain while he was maneuvering the ship in the locks. Did I mention Brian? Omni-present, very affable and helpful, he was the public face of the ship, and greatly contributed to the success of the cruise.
This is not for people who want glitzy ships with climbing walls, skating rinks and 4000 other passengers, but for a low key and intimate experience I would thoroughly recommend it.