I have a 1985 Bestway 40 ft. Labelle Sundeck with Volvo Penta's. It is Taiwanese of moderate quality. There were enough made in the mid eighties that they got a lot of it right. The volvo's are a very good engine and max rpm is usually 3600 for pleasure and 3000 for comercial uses. All that I have seen are turbocharged. The TAMD 40's, 41's 60's made in the eighties are getting old but parts are still available some new and lots of used. Parts prices are outrageous. Fortunaly the engines are high quality and not many parts are needed very often. For example the last three years all I have needed is circulating pumps at $650 each. Filters, oil and glow plugs are all available from generic sources. In summary I have found the Bestway to be a lot of boat for the buck.