Small Question Regarding Concert Tickets

[Uemarasan]

Hi! This is a question I'm throwing out to the fans who've managed to buy concert tickets (official or regular tickets and not those from resellers and auctions) while they were in Japan. How risky is it buying concert tickets on a general sale day from PIA? Are mostly not-so-decent seats available if I buy then?

Here is the PIA website: info.pia.co.jp/et/promo/music/ayu.jsp

As far as my Japanese goes, for the May 19, 26, and 27 concerts, 3/30 to 4/9 is the pre-reserve time period. And then 4/22 is the general sale day Do I dare risk a general sale?

If anyone can help me, thank you so much in advance!