Sounds very promising - I will be wanting 10,000 addresses where each address has a specific 5 character (after the 1) prefix. Do you have a rough estimate how much this would cost?
It actually depends on the specific chars. The site has a quote engine that prices it before submitting a request. I took the vanitygen probability estimator and wrapped it as a Python module for my web app.
Currently I've set a max qty of 1000 to limit long runs that could potentially get stuck or have some problem and not be detected.
As an example I ran "1Lover" thru the estimator and it spits out the following prices,
100 qty = 0.012 btc, 62 minutes
1000 qty = 0.124 btc, 618 minutes (yes, about 10 hours)
(ie. roughly 0.1 us cents each)
This isn't definitive yet as I may tweak the pricing. It's based on probability but once a price is quoted and job submitted the price holds even if it takes longer than expected, barring some calculation error. I base the rate on a multiplier to current mining rates.
Some letters take longer, eg. 1Queen @ 100 qty, estimates at 61 hours.
Also, long jobs may take a bit longer in real time. I'm working on job prioritizing code so long jobs may get paused to handle higher paying short jobs.