Our previous boat, a share boat, had a TP fitted to a Beta 43. When it worked it was wonderful, boiled a kettle, ran a powerful vac or any other appliance we wanted. The main problem was getting the thing to start! Something to do with lack of remnant magnetism apparently, probably the teenage designers had never heard of it.
The death knell of the TP was sounded by the catastrophic and expensive failure of the crankshaft - again poor design was responsible, it seems no-one realised the forces involved when an extra pulley is just tacked on the front of existing ones.
So that has been our experience of a travel power, a good idea spoiled by poor design and fitting. If these problems could be overcome, however, we would have another.