You're right. My use case is also Mac to Mac and Barrier/Synergy does not provide the UC experience. No multi gestures support - and the thing that annoys me the most - trackpad scrolling events aren't mapped one to one, you end up scrolling lines on the target, not the precision you're expecting.
To be honest I'm not sure if Barrier developers could actually mimic that without resorting to some sort of undocumented APIs and/or obscure techniques.
This! The i740 was my first "real" 3D graphics card - I remember running the Final Reality benchmark on it and feeling genuinely excited with the purchase.
After that I got the Riva TNT (Diamond Viper V550 iirc) which changed everything from a consumer point of view. Good times.