I have about 3 different devices, all of which seem to work well.
1. A device identical to your picture.
2. This "other" tea ball: https://i.imgur.com/Hg0mWFl.jpg
3. Tea "infuser". Similar to this one (but a different brand): https://images-na.ssl-images-amazon.com/images/I/41QJxs18f1L... . This is the bulkiest option though, and you still need another cup to transfer the liquid to.
My favorite tool is #1: the "springy clasp ball on the end of a stick". So I can recommend that to everyone over the other two devices. #2 isn't bad, but there's a lot of convenience factor to #1's spring design.
> In terms of convenience I don't think it's significantly worse than sachets.
In making tea, no, not much difference. But I dislike cleaning metal-meshes. Cleaning is a minor inconvenience... but if you've ever just used a paper-cup + Lipton tea bag and just trash everything when you're done... lol. Lazy lifestyle (but wasteful).
But yeah, its probably better for the environment to have these reusable tools, like a coffee mug.
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By the way, Lipton does sell loose tea, if you're a fan of Lipton. But I live near a tea / coffee shop with superior teas at low prices, so I just grab what they have instead.
As far as store-bought tea is concerned, Twinings is tasty and widely available. I'd take Twinings > Lipton any day. Lipton is slightly cheaper, but Twinings really does taste better.