I used Fast Track last week when returning from a trip to Hong Kong. Long lines at the regular immigration counters but Fast Track was NO wait. Also, my under 70 wife can use Fast Track because she is with me.
I had contacted them about a month ago for visa help.
There was something about them that gave me a bad feeling, so went with another agent who actually took me to immigration and I met the officers doing the visa processing.
The ideal waiting time is 6 months between extraction and implant. Then another 6 months between implant and crown. With front teeth, they can often skip the wait between extraction and implant.