I bought one a while back and just used it yesterday for the first time. I don't have anything to compare it to...but it seemed to work pretty well for me. I washed it really well and before I used it I greased it up with a little bit of crisco. I don't know how the other ones work, but this one has a handle that you turn...kind of annoying, would be easier if it had a push handle?? Anyways, hope that helps a little...
The twist-top handle is better than the push kind. The most popular one is the Makin's Ultimate Professional but most Michael's dont' carry that any more. I haven't seen the Walnut Creek one but I was chatting with another CCer about this -she had them both in hand and realized that piping tips will fit into the Makin's one; think she said they don't fit in the other one but don't quote me on that 
I bought the Walnut Hollow one and it worked the first time but your fondant needs to be super soft or the black plastic ring will get stressed out and disintegrate, causing your ropes to get peppered in black plastic - blech
It's also a pain because the black cover on the extruder turns separately from the metal extruder so you have to really grab onto it hard - I actually had to use my push handle cheapo extruder because it was faster and worked better than the Walnut Hollow one
I think I just need to fuss and practice with it more though
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