I was having problems with the seat early on but I needed to tilt the back further, lumbar not applied as per what Thomas says. I have it fully jacketed up. The bolster may settle down a bit, mine have got better. I wouldn't have been happy to have lost another cubby hole to the seat electric motor so I didn't specify it and I don't think they have built any with it yet.
The suspension is kind of interesting that it does roll sometimes. 19" you feel the road bumps but then I don't know how that compares with the 18". It can get a bit noisy on some road surfaces but that could be the tyres. They actually have different manufactures on the front to the back of mine... don't ask me what they are, I'd have to read them, but they aren't the same.