I haven't tried one yet, will have to wait a couple of years for my trees to start baring fruit, but by all accounts from those that have grown them - most of which comes from the USA - they do taste the same, have the same level of acid, are exactly the same in all ways except for the colouration. I'm interested in making my garden as different as possible, so when I decide I want a fruit tree, I look at all the different varieties of that fruit tree and ask myself, "Can I get this variety at the supermarket? What variety looks different to the norm but still tastes great?" This has resulted in me getting pink lemons, apples that are pink on the inside, peaches that are purple, pears that are tiny, plums, peaches and apples that are huge, cherries that are yellow, and a couple of varieties of apples that are common but taste so much different - and better - when allowed to ripen fully on the tree (rather than being picked too early for transport to the shops). They're still all saplings at present, but as they grow and start to bare fruit I'll write something about each of them here somewhere - either post or article, with photos, etc.