We have noticed 2 bugs regarding quantum suit while playing on a server.
1. While speed running on ice blocks and using boosted jump you go so fast that server kicks you for hacking
2. After returning from nether to overworld, first boosted jump results in ongoing acceleration. You go up faster and faster until server kicks you for hacking. The jump lasts just half a second before kick but the acceleration is still noticeable.
Quantum suit speed bug (SMP)(1.97)
and both are known about and have been reported many times already.