I have two Nav Systems. One is an older one installed in my FJ Cruiser. The Eclipse AVN726E. This unit is not slow at all! I was very impressed with this unit when it came out and I am still impressed with it. I think it was one of the first 3d Nav systems out. The building looks crazy when in downtown LA. The Nav system itself runs smooth, but it does have its flaws. The menu does look outdated! But its fast. I can type in an address just as fast as I can hit the screen.
I also have the latest Pioneer. The AVIC-Z140BH. This thing can do 100 more things, but like you said. Its a little slower then my Eclipse. The menu looks up to date! Some of the ideas are great but sometimes it sticks, and the menus dont flow. I am sure they will have updates that will attempt to fix the issue some day. I like the unit, but as far as running smoothly, the Eclipse hands down will beat it.
I guess it all depends on what you want. The Eclipse menu looks outdated but runs smooth. The Pioneer looks up to date and has all the bells and whistles but does not run as smooth as i think it should.
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