Hi,
We have been cruising a Tiderunner 23 for about 5 years. I had a Ranger R-21 tug with a Yanmar 2GM20 but we opted for more cabin space.
For the size of the Tiderunners they have an amazing amount of storage space and they are easy to trailer if you want to take it out of the water in the winter. They do have good heaters and do reasonably well in rough water in Puget Sound. They are small and have a round bottoms so they do roll and you have to remember it is a small boat. We spend up to a week at a time on her and for the two of us it works well.
We looked for a long time to find ours but they are still out there. I believe that most were powered with small VW diesels when new and they didn't have a very long life. It was a good engine but it was just too much load for it. If you find one that still has the VW or has been repowered with Puegot
you will most likely want to repower with a new engine as parts are getting hard to come by for the older engines. Ours was repowered with a 60 horse Isuzu C-240 diesel and it is a great engine both for its economy and parts availability.
When you at the prices for new small diesel powered trawlers we think they are a bargin.