This was the 1st time I did it, so I plan on using the BIAB method again.
Did you check to see what kind of efficiency you got?
I have a 7 gallon and a 4 gallon brew pot, I figure using the second pot for a BIAB sparge I should be able to get 70%+ efficiency. With two pots I would be able to use two burners on the stove to get my wort up to temp for winter indoor brewing. Additionally grains would be more manageable and I wouldn't have to clean my lauter tun which can be a pain in the ass over the sink.
The only major downside I see is getting too many solids (protein, grain powder etc) in the wort that would be filtered through a set grain bed. That and larger beers would require a good size rig for draining the bag.
Actually as I think about it, a custom lauter tun shaped strainer bag would save a little bit of cleanup time...