The only problem with the dead ringer is that, with ragdolls disabled, you can easily tell when it's a "fake" kill because you see the spy ragdoll fly when it normally wouldn't.
{pDs} Lead Salad: bike why did you change your name
Jessica343: so I can get heals
{pDs} Lead Salad: oh damn good idea
{pDs} Lead Salad has changed their name to {pDs} Lead Salad (is a girl)
Jessica343: hahah