I bought the regular Power in 143. I've been on an SMP Drakon.
I really wanted to like this saddle but after nearly a month of rides, I could not get it dialed in to the same comfort I have on the SMP. The Power seemed a bit too wide in the rear; created some blisters/sores I've never had before.
The Power is mostly a one position saddle and I do move around a bit. I had no problems with the short length at all and appreciated the light weight.
I returned it to Spec for full refund, which is allowed up to 30 days. I asked my LBS to match this policy as I preferred to support them however they declined so I bought directly from Spec.
Back on the Drakon (which somehow feels better now!)
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