I was disappointed with the Zolo Backdoor Cup, it felt very cheap and not the quality I was hoping for, although I should have expected this for the price range this product falls within so that is my fault, given that, I still wouldn't recommend purchasing it as the rubber/silicone inside the masturbator itself is not firm in the slightest, its very very flexible and squishy, because of this, it fails to provide any real sensation. You are better off spending a bit more money and getting a higher quality masturbator that will give you a better experience, and be made of higher quality and more suitable materials.
If you're looking for something that's not the usual masturbator or cup then this might be for you. Having **used a lot of male masturbators** I was left a little confused by the instructions of remove outer layer wrapper and cap and insert, it's a strong habit of mine to clean my toys before and after use. But I did follow the instructions and it was a great fit.
It could have done with a bit more in terms nodules and ridges - when I closed my eyes it didn't feel that different to other masturbators I've used. But at the price it's pretty damn good value. It's easy to use, there's no struggling trying to hold a TPE or silicone toy and a better fit in the hand than other similar types of products.
If you want to try something different then go for it! It doesn't cost the moon if you don't like it and it's different enough to be exciting like a new partner.