Yes, highly recommended, I wear them out and about all the time. They are not easy to conceal completely, no nappy of that thickness is, and in theory if someone looks closely they will probably notice that you are wearing a nappy. But I wear them under jeans all the time and no-one cares. They are favourite for situations where I will have high fluid intake or limited opportunities for changing, or if I am expecting to need a BM (because of the excellent inner leakguards).
If you are not really planning to use them heavily then I suppose it is a trade-off between the particular fit and feel of the Betterdry and being semi-noticeable. For me any negatives are outweighed by the confidence and convenience that only a high-performance nappy can offer.