The lift is great. Al has one, too. It's made by JessEm but with a few small changes for Incra.
I have the rockler cast iron table (the one that works as a table saw wing - not sure if they have another in a more standard size). I think it is fine but not ideal. I bought it so I could use magnetic hold downs and such, but it turns out that the lift plates are aluminum, so the area where a magnet will be helpful is too far from the router. Cast iron is also useful for vibration dampening, but routers are pretty vibration free, so it is not that big of an issue. Where the cast iron was useful was using it as a table saw wing, but I have subsequently removed it from the saw as I found the setup didn't work for me.
On the downside, the bottom of a cast iron top is not smooth which makes attaching clamps a pain. It also makes attaching a fence difficult. Additionally, rockler lift plates are their own size which means that your lift will have to fit it (incra obviously makes one that does) and you will be stuck with rockler if you ever want to change the table, get a new lift, etc. That may or may not influence what fence you can get. My top came with the "benchdog" fence which is functional but not my favorite. I've looked at the other brands of fences, but it's not clear that they will fit any better.