I have used his deputy service for several times,
he's pretty good.  You'll need to give him your
maximum bid, and he'll bid for you.  After that,
he'll contact the seller and give you the final
cost.  The commission fee is 20% of the final
bid of the items, and I feel this is quite 
expensive, especially if you buy an expensive
item like a thousand buck, he will add $200 on
top as the commission fee, ouch...  
Anyway, he is good of what he does, pretty good
service, recommended.  By the way, don't write
complicated English in your email since he depends
mainly on his English/Japanese translation 
software.