I actually enjoyed the wuyi oolong from Adagio at first and then I didn't like it as much, it actually reminded me of Fruity Pebbles cereal which I never liked as a kid...I got two infusions out of it and then threw out the leaves, maybe I should have tried another infusion? I know that different infusions can give different flavors, scents, etc. So, I'm going to have to try more samples now...
Interesting how your enjoyment tapered off after a couple of infusions. I've also been initially impressed by some teas only to have that end after a couple of infusions. If you threw it out after two, I doubt you'd find any better flavor in a 3rd infusion.
Some teas go on forever and others seem to fall short on brewing durability even though they may taste great. Hou de's teas tend to last long but they're expensive per ounce compared to what other vendors offer. Considering the quality and durability, I personally think they're worth the price and are actually a good value. However, where you're still undecided on what you prefer they may be too expensive to experiment with.
I think continuing buying samples is a good idea. When you find the kind of tea your want, you can then try small orders from other vendors if you wish to "upgrade." Be warned, though, that tea can and tea ware can become very addictive (and expensive)!