I don't much like cocaine. I've done many drugs, and many stimulants, but cocaine is one of my least favourite. The undeniably short period of effects coupled with the ridiculous cost makes it unappealing. I'd never buy it myself, though I'd partake if a friend offered to share.
That said, I did have a period during my IV hydromorphone stage when I would IV purified cocaine, wait thirty minutes, and then shoot my opiate.
I LOVE the cocaine rush, done intravenously. It is overpowering and amazing. Other routes of administration, compared to IV, are simply pointless. I found cocaine rushes to be TOO good, and I ceased using it because I knew that it would become a controlling part of my life.
Amphetamines are FAR better than cocaine, as stimulants go. Speedballs are great, coke on its own is great, but for so lamentably short of a time... Simply not worth it.