My local club has about 4-5 guys on the same pace consistantly, one is a sworn brushed guy and he is using an 8t, there are a couple of 7's and 9's and one BL system, thats a 4.5, the thing i love about the system is the no maintenance (very little)
The systems are all very evenly matched and whoever wins on the night comes down to who made the least number of mistakes in the race