I have used the Shocktech and the Hybrid ITB2 System, and compared to the RMR Killstick, RMR is the better performer.
2k2 Intimidator - WAS2.6 - Killstick Bolt with spike - high flow barbs - WAS trigger switch - reverse magnetic trigger - Halo B - 68/4500 Pure Energy.
The main strength is the weight, it is a few grams lighter then stock.
None - but the spike pin is heavy.
The RMR Killstick is a high quality bolt that i think is one of the best on the market. Its the lightest compared to the ITB2 and the shocktech. The ribbing on the bolt contributes to its light weight and the lessend weight means almost no kick/recoil, better consistancy, although Intimidators already have almost no kick/recoil - so with this bolt it virtually eliminates that effect. The quality is top notch, and the cool Gattlin Gun back is eye catching. The front and dual middle O-rings keep a good seal, the black color eliminates false eye readings, and its ultra-smooth delrin finish helps with efficent fast actuation. I purchased the bolt with the spike pull-pin, the weight of the Spikepin is a bit heavier than stock. I saw very little differance between using the stock pin and the Spike pin with the kill stick, but i know that that extra weight on your ram will effect consistancy and how hard the ram is hitting the valve. Other than that the Killstick is the best i have used. Lightest of them all which means its faster and more efficient not to mention the price. I purchased mine online for 24$.
If you want a good, lightweight, high quality, fast, and good looking bolt the RMR Killstick is perfect. Although RMR is fairly new to paintball they know exactly what the players need and im sure you will see most of RMRs upgrade parts on Proguns soon. The killstick is built by player for players so check them out. i think i will try their RAM next.