We use the Rogue Butcher sled for off the bike strength and power work and find it effective. We do however also use a smaller sled, the name and brand of which escapes me at the moment, to do on the bike work pulling the sled WITH the bike. We usually do these for acceleration power and sprint start power. Also has been effective. The facility we train in is very accommodating and we typically will combine the sled pulls or pushes with a workout on the bike and the trainer replicating similar stimulus.