i had a Slingshot for 3 years. It has much more room and extras that we like in the US. (cup holders and music). It was too quite so I put different exhaust on and added many $$ add ons.
I loved the engine but its weak point the the 90 degree rear gear box. So I started to look at a Vanderhall. Sold my Slingshot (they dont hold their value) most have a big lost when you sell.
Saw a video on the M3W and loved the S&S motor. I am a Harley owner for over 30 years. Love the looks and sound of the M3W so a few months ago bought a used 2017. So far love it.
Now after reading all the issues with the rubber compensator rollers and fuel pump I hope I did not make a mistake. Mine only has 3000miles so it just might out live me (i am 72).