This is my second time on Japancupid paying for a gold membership which I only do a month trial at a time. While the site is good in general, it is very difficult to get a relationship started with the Japanese members unless you fit into the females very small selective category. I have to admit I've been pretty picky too so I'm rather picky... except most of the current women there (from Japan) seem to think there are enough wealthy, movie star Caucasian males willing to take them in like some Hollywood romance comedy film are roaming the site (and just happen to be in Japan) looking for them.
One of the things that does concern me about Japancupids service is when they send you a message saying someone is interested in you and it actually turns out they just sent some random person's profile your way and they never really actually even checked you out. That gets very annoying very fast. I've been fortunate to have a few check out my profile that were actual members and not Japancupid initiated.
Its always good to identify that the people on this dating site are not completely representing the quality of the site.
Unfortunately with my current situation I think it is better to actually be living or visiting Japan to get more hits. I'm in my mid 30s and look a much younger than my age (with at least above average looks) but from my experience I've had more women 19+ checking me out and hitting on me when I'm there in person.
So unless you're there or going there soon, its best to probably avoid signing up until then.
Great search engine, free chat and IM, lots of members.
The women can be very VERY picky, and rude. Gold membership has some good upgrades but you have to pay a bit too much for Premium which pretty much only gives you some very small additional options.
Darknile does recommend JapanCupid.com to friends/family