990 owner here - if you're selling your 690 pm me!!
To the topic the 990 is pretty darn heavy in rough stuff but I've done some big rides on it (coast to coast and back in a short time hitting parts of the tat) that would have been really tough on a smaller bike with shorter service intervals
Having done those rides though, something lighter sure would be nice for some rougher trail riding in the sierra. Not that the 990 couldn't do it in the right hands though