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I ran a GPX for a while last season.
I thought it was on par with Shimano.
Both are a little tight at first...but loosen up some( get easier to spin)
If it seems harder than normal, first make sure it is installed correctly ( not too tight) and / or take your frame to a good shop and have it faced (this can make a huge difference on some frames...in both how the bb works and how long it lasts! I do it to all frames now)
I did find the GPX didn't last very long in really wet conditions ( it rained almost every time I rode)
 

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Are they broken in yet? The seals are a bit sticky initially. but you are right the Shimanos start off smooth from day 1.
I have 3 truvativs and 1 Shimano. The truvativs definitely take 10+ miles to let the seals break in. After that I'd say they are as smooth as the Shimano. Also make sure you torque it properly when you install. If not, the are comes loose and makes it eventually un-usable. I destroyed one like that and moved to the Shimano.
 
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