Mamachelle! Snap, 12 months 5 days between my DD1 and DD2!
Would have been under the year but DD2 was very overdue.
I'm still in the "finding it hard" phase (they're 2 and 1) but I've got nothing to compare it to as they are my only DCs. DH is coping amazingly but finding it extra hard having to "worry about 2 other peoples bodies" as well as his own (they're both at the eat anything and bang into/climb anything stage). We wouldn't change it for the world though.
Advantages I have noticed- nappy/bottles/poor sleep phase over with almost at the same time, same toys/tv shows and interests on days out, same "toddler food/snacks phase, share clothes, same friends, same sleep times so we get a rest midday, very close and loving towards each other overall (never been a day apart since DD2 was born).
Disadvantages (other than the obvious) - DD1 isn't old enough to do things independently while dealing with DD2 (eg put shoes on, climb into car seat etc), hard to teach DD how to be safe around DD2 (ie don't climb in her cot and belly flop on her), both seem to get ill lots as they're both building their immune system at the same time (and one crawled and sucks her thumb), child care costs are v expensive for 2 babies at the same time and family aren't keen to have them lots as they're a handful, every waking moment is spent minding them both so any housework has to be done at night and there's a lot of housework with 2 v small ones
Basically it's brilliant and getting better every day but be prepared to not stop from 7am until 9.30 at night for several months. 