Many ex hire boats follow the Black Prince style of layout and generally have reliable (and well used) systems installed. Engines could have high running hours but are usually well maintained. No hire company can afford to lose £1500 to £2000 per week in high season because of poor maintenance.
Ours bought 2 1/2 years ago is an ex hire boat with a Reeves hull and Isuzu engine and has performed well. There are many Diy improvements that can be made so that the boat is tailored to your needs. Ours was a 6 berth, now converted to 4 berth with the L shaped dinette removed, Captains chairs and fold down table installed in its place. Of course solar panels have also been fitted which cover our charging needs from March to October.
Find the right boat (at the right price), ensure you have it surveyed and enjoy.