Having used one man tent's a few times i must say i'm not a lover, heavier than a bivi bag but not that much more comfort, i know most are designed for comp use but at 6'1 i'm touching both end's or my face has a nice drape of netting over it from the side wall
a lite weight 2 man tent is ideal for me if i want my kit in with me, much more gentlemanly
Actually scrub the above, i've just flogged my bivi bag because as soon as i used my hammock for the first time i knew it wasnt going to get used again