More expensive, most likely. I'm not sure about slower. I get +37.3 meg/sec sequential reads off my 45 gig IBM drive, which is supposed to get 55 meg/sec according to IBM's website. I guess there's a little bit of performace hit =)
You can round ribbon cables yourself (successfully) with a box blade, scotch tape, and some patience. Electrician's tape looks better, but cherry tape would be more flexible.