You get used to it. And yes, it will indeed have similar issues. On average expect to get your merch several months down the line. This is still leagues better than the geekjack days of ordering an item receiving it nearly a year later.
Decided to pull up my emails I ordered Aki's Rose of the Lamp set on June 1st, it was shipped at the end of October of the same year. So make of that what you will.
Edit'd to not overly exaggerate how bad it can be, but man it can be rough.
Also this.
Oh god if she has merch for her next concert.. my wallet..