Like most mobile phone shops, this one enjoys a confusing layout and less-than-completely-helpful staff.
If you know exactly what you want then you can have a reasonable experience, but if you know exactly what you want then you’d be better to go online. If you’re not sure what you want, you’re going to have an unhappy time full of upselling and jargon… so you’d do better to go online.
The network itself is good: broad coverage, good data speeds, nice international deals. But this shop is a perfect example of why their shops ought to already be a relic of history.