Unless it's a cutting edge fashion rag, always assume the info in the magazine is months old.
I subbed a story (fiction) to one, didn't get an acceptance until 8 months had passed, and it was another 6-7 months before it hit the stands. I got my author copy two full months before release.
As far as the writing mags go, save your cash and read in the library. If it has an article you want, the photo copy machine is cheap.
The last, absolutely LAST time I subscribed to one was over a decade back. I was an established mid-lister and thought I might submit an article to them. It would help pimp my titles and I'd get paid, to boot.
Against my specific written instructions, the damn magazine gave my address to every writing business with some rip to pimp. I was invited to join the "Famous Writers' School" and got invites from vanity houses who had "heard" I had a book to sell and boy, they wanted to see it!
I think it was iUniverse who claimed they'd paid over a million dollars in royalties to its writers. On another page in the letter it let drop they had over 9000 titles to sell. I did the math and was unimpressed by the average of 111.11 earnings for a book that would cost thousands to print.
I explained as much in a lengthy mail to them, inserted in their handy, postage-paid envelope, telling them to stop sending me trash.
Had to send another letter (pre-email days, kids) to the magazine telling them what I thought of their pimpage and to take me off their mailing list.
I'm agreeing with the rest, the mag is a venue for ads and might contain a kernel of useful info now and then.
Who recalls the issue that screamed "Interview with J.K. Rowling!!!" on the cover along with her pic?
I was wise to that one. The interview was a transcript of a 3-minute phone conversation, padded with biographical fluff from Wiki so there was enough content to fill two pages . . . one of which was all-pictures.
It's funny, but I remember back in the day those mags were once useful, packed with real info. I hung on to those old issues. They hold up.