I saw one of their little "Billy no mates" inflatables at the London Boat Show in January, and it looked perfect for a RIB tender. I think it was from the NSA range, not the Ultralight, but there's not much weight difference anyway. I had a picture of it somewhere, but I can find it now . . .
The little Lodestars have inflatable keels which is quite unusual, as most others seem to stick with flat floors under about 3m.
I would be tempted to go for the NSA230 as it's a decent size, packs to the same size as the smaller models and only weighs a few kilos more.