Cod don't know about all The Suzukis but the 140 is quite are slow. For example we have a 2-stroke 115 Yam on one of the 640s and a Suzuki 4-strokes 140 on another. Both boats same weight if you exclude the engines. The boat with 115 has a top speed of 39.8 knots on the GPS and the one with the Suzuki 140 has a top speed 44. Both engines have the standard props.
May be the Suzukis are good (although will not trust a 4-stroke) but this one is bloody slow and expenssive for the extr 4 knots that it gives. Economy same as the 115 by the way