When you buy from your local food market, you have no guarantee, and you can't take it back. Buying budget audio kit is exactly the same. If you buy from China or India you are doing so because of the price. A thirty quid microphone is what? 3 pizzas? You buy them and if ty fail, you throw them away. The postage back to China or India is half the price of a new mic, with no assurance you will get a replacement. If I buy a television for £150 that's about my limit now for even bothering to remember who I bought it from and when. I have a few of these sitting in my store, unused bought on a whim when offered at a silly price. I tried one. It's fine. A great disposable mic. It really doesn't warrant anything more an this. I'm doing a huge recording project in a week or two and I need loads of mics, BUT the venue is not friendly, and damage is pretty certain. I'm talking about children. So cables will be tripped over, stands whacked, idiots fiddling with the mics, and no way I can prevent it. I don't wish to use my best kit so I'm thinking it's going to be my collection of disposable mics. They'll perform well enough and when somebody whacks one and says "it's not working" I don't fret.
While 25 quid is for some a lot of money, the reality is it is not. It's simply not worth worrying about. Buy it, use it and be happy. If it arrives dead, they'll send you another. Why think further ahead?