Dolce Gusto machines has very bad design (might be intentional point of failure actually), water passage is very small and leads through pressurised maze, with time it clogs up with debris and scale pressed to the walls and proves impossible to descale. Additionally each time needle pierces a capsule a bit of coffee gets back into the passage which doesn't help things. We lost two different machines to the same fault within 14 months from purchase. Choice of coffees is poor compared to Tassimo and I found our work machine was never producing drinks of satisfactory enough temperature.
Nesspresso, machines have nice boutique design but they fail miserably with boutique sales model. You'll find capsules impossible to source from anywhere else outside official channels on the internet, Nestle is the only manufacturer (and it's not like they are known for their coffee) and prices are oddly high.
Tassimo has the widest choice of coffees, mix beverages, chocolates and teas (unusual for this market) from widest range of manufacturers (well known continental names), has imho the best and straight forward machine design (compact, but not oddly shaped at cost of functionality), capsules are readily available in all supermarkers and you can get very good discounts for bulk orders from many places, including known forest shop.
