Well, I can only speak for recent, 2-3 years old, and current gen products.

The previous gen, was indeed limited to 11-14mbs, but I only ever got a constant throughput of 5-7mbs max. That was fine, as you say, internet is 2mbs max to the house, and the slingbox WAS only transmitting at 2.5kps

The current GEN, the "hd" version, quote 800-200mbs throughput, but I have only ever gotten a consistent 35-40mbs throughput. Which, as experienced is LESS THAN quote 802.11G tech, but my best throughput on G was only 22mbs.

Again, LESS than the internet speed, but I do a lot of large file transfers back to a central server, and NAS, so speed is a plus.

AND, the new PRO slingbox, will do about 8mbs throughput, slinging the HD signal over the LAN, which looks VERY nice indeed. So, the new GEN is an improvement for constant use, but only for this application.

I HAVE had problems with all the devices, in ONE plug in the house, when the overhead LIGHT is on. It doesn't make a lot of sense, but when I switch that overhead light on, BOOM, all throughput goes to the crapper. Switch light off, and we're back on the autobahn.!