The Mark IIb Land Raider Phobos is one of the earliest marks of the standard pattern of Land Raider, and it still bears similarities to both the Land Raider Proteus and the Spartan Assault Tank that served as the models for the design.
The Mark IIb Land Raider Phobos is the only pattern of the standard Land Raider Phobos that uses the older armoured sponsons, as they do not allow the weapons they hold to fully rotate. This pattern of Land Raider is mostly extinct within Space Marine Armouries, having been replaced with newer marks and patterns of the standard Land Raider Phobos. However, some Chapters may still possess one or two as treasured relics of their ancient past.
The Land Raider MkIIb is probably my favourite Land Raider variant. I do have one of them in my collection. I knew that if I was going to get a Land Raider it would have to be the Forgeworld MkIIB Land Raider. I did get one in the end at GamesDay 2006. Sadly it was recently retired from the range. I wrote up some reflections on my MkIIB Land Raider, on the current state of the painting and what I needed to do next. In the end I went down a different route.