Are they any good?

I am looking at flats and some of them are only accessible via the stairs but have communal gardens, so I was toying with the idea of getting one of these and putting it in the garden, has anyone used one and what are your thoughts?

I've got the Trimetal bike store. It is well made. Nice opening mechanism. Took quite a while to put together but worth it. Feels quite secure but would recommend using a ground anchor to chain the bikes too. The only issue with it is that it isn't quite long enough to take XL mountain bikes. My husbands large frame bike only just fits in. We can easily put 3 bikes if you loosen and twist the bars on one of them. I would still be reluctant to put my nicest bike in it though so it still gets taken into the house to be on the safe side!