No probs. I got mine presale on Wednesday but it looked a lot easier to buy on theo2.com than on ticketmaster or live nation.
There's lots of wailing and gnashing of teeth about the amount of tickets already appearing on getmein etc at inflated prices.
I'm going to the Dublin concert :-)
I'd suggest going onto bookings.com and bag the nearest one that allows you to cancel just before the date. You can then keep searching for better deals after that.