Not really bulky, and a lot less than they look in the product shots. The toe is very low and not puffy.
I tried a half size down since they didn’t have the right size at that shop but it was way too crammed for me, my toes would pretty much hit the front. This is of course individual to everyone and how shoes generally fit them, I have definitely worn a similar half down size in Dunks and Vans before but in hindsight they have been what I now would consider too small and in my opinion the 1010s are true to size. No heel slip issues or anything like that, they are specifically designed against that and feel great.