I've owned my Saracen for about 4 years now and, for the most part, maintenance is time consuming but not overly difficult, although everything is harder to get at than it should be. Where you might have problems is if anything breaks (mine destroyed a hub), it's very big and heavy to remove and replace, but the spares are out there and aren't too expensive.
Another vehicle that you might want to consider is a Ferret. They're a little smaller and easier to live with than the Saracen, but have pretty much the same running gear. Being a physically smaller vehicle, things are easier to get to and maintain. Compared to the Saracen I would say that the ferret is a little more cramped, considerably faster and a whole lot less civilised. The Saracen has a double floor, so the layer of oil and grime down there is generally hidden, while the Ferret does not, and the Saracen has considerably less interior noise. The Saracen is also easier to get in and out of and has much more interior room. I really like my Ferret, I love my Saracen.
Cheers,
Terry