As the guy above I've only used DIY concentrates from LT, from their own brand stuff though (not sure if all of these are available mixed):
Cappucino - Good, sweet, milky coffee. Not too strong on the coffee though.
Lime - Nice lime flavour, not entirely like a real lime but a nice balance of sweetness.
Fresh sex - Menthol too strong for me, with a hint of some fruits in the background, would've been nicer with more fruit/less menthol.
Heritage (raspberry) - Weak, tastes vaguely of raspberry but disappointing even when mixed stronger and stronger.
Sorry can't help more those are the ones I've tried.