We were very impressed by a Nespresso machine we used when staying at a friend's house, but ended up buying the Dolce Gusto system because it offers more variety in types and sizes of coffee (including cafe latte and cappuccino, both of which we love).
We now wish we had stuck with Nespresso. The Dolce Gusto system (we have the Krups Piccolo machine) is efficient, clean and user-friendly, like Nespresso. The coffee pods produce reasonable coffee. However, none of the coffee flavours we tasted came anywhere near the quality of the best Nespresso ones. For us the best of the bunch in the Variety Pack were the intense ones (Espresso Intenso and Crema Grande Intenso) and the Cappucino. The Latte was bland and disappointing (the Skinny one even more so), as were most of the other types.
If you have already bought a Dolce Gusto machine, the 9-Flavour Variety Pack is a good way to test a range of flavours to decide which you like best. But it does work out more expensive per coffee serving than buying flavours in dedicated packs. And as mentioned above, we advise you to go for Nespresso rather than Dolce Gusto in the first place - unless and until Nestle expand the range of coffees available to include some real refined aromatic ones like Nespresso offers!