I have installed the Vetus BullFlex before but not a Type 6. I liked the BullFlex but you need a little more space for it.. If our engine needed something I would install it but it is the smoothest sailboat drive line I've felt on any boat, and it is smooth as glass throughout the entire RPM range. This is not by chance and the installation, mounting and alignment to the strut, truing of the shaft, fit and face of the coupling and the gear box output was quite time consuming but paid off big time. I work on lots of boats so lucky for me I also get to see lots of drive lines in action. The Type 6 looks great and I will keep it in mind. The price is not too bad for what it is either. I've also used a flex coupling out of Florida but I'd have to go through my catalogs to remember the brand.