I booked a black (they didn't have white available) stretch limo for 10 ppl (I had 8) about a month before my wedding. The limo was there on time and patiently waited for the bridal party to be ready to leave. They provided a champagne bucket and glasses. The limo driver drove them around longer than he was supposed to though and we ended up waiting for them at the reception site to do the grand entrance. We had asked the limo driver to give the party a brief drive through downtown Seattle since they lived out of state.
Pros: provided a champagne bucket and glasses
Cons: took longer to drove them to the reception than agreed upon