Have never owned one but seen heaps of them. First came across Turkish gulets in Male in the Maldives, nice looking boats. Had a Turk friend who built a big one, it was really pretty and well built, so I was surprised when he told me he hoped to get seven to ten years out of it before he would have another built. They are mainly built with soft wood and require a lot of maintenance, great if you like doing that sort of stuff. Most do not sail at all, there are exceptions though. They have great big engines and I do mean BIG for a cruiser. Travelled in company of one for awhile, when we were taking on 100l of fuel he was taking 7 tonnes. They can be a bit rolly. If I bought one I would sheath it in glass, saw an old dow in Oman being sheathed, came up really well. I think an old dow would make a better big cruiser than a gulet as they sail well.
Happy boat hunting, I hope you find a boat that suits your needs.