I don't have a Ripley V4. My two cents (its the internet, everyone has an opinion):
Positives and negative's of changing the head tube angle on the Ripley 4 depend on how much you change the angle. A slight change like over forking to a 140mm fork or a 1deg HTA change gets you close to Ripley AF geometry. If you go more than 1deg, you might run into some issues with handling and stability. if you change the HTA 1.5deg to 2deg now you have a HTA close to the Ripmo, BUT... but your wheelbase, seat tube angle and trail will be different than the Ripmo. Hard to say what that would do to the handling.
The good news is if you do you own wrenching on the bike, experimenting with an angle-set will only set you back $100 and some time.
Positives and negative's of changing the head tube angle on the Ripley 4 depend on how much you change the angle. A slight change like over forking to a 140mm fork or a 1deg HTA change gets you close to Ripley AF geometry. If you go more than 1deg, you might run into some issues with handling and stability. if you change the HTA 1.5deg to 2deg now you have a HTA close to the Ripmo, BUT... but your wheelbase, seat tube angle and trail will be different than the Ripmo. Hard to say what that would do to the handling.
The good news is if you do you own wrenching on the bike, experimenting with an angle-set will only set you back $100 and some time.