My dealer tests his pills (with a testing kit I swapped with him for 3 pills) and then I test them myself when I get home. I don't test every pill in the bag but always test one or two and check them all carefully to make sure that they look exactly the same. Not quite as good as checking each and every pill but better than just saying "Hey, ma hookup's a bro ta me". Will be using the E1-E2 test as of 21/7.
Harry
PS EZ is NOT foolproof, had some pills which tested as very good (straight to black) but were absoulute shite, took 6 in a 10 hour period (as in took one, waited 2 hours, took another, waited 2 hours, etc - total buzz was about the same as a quarter of a normal pill!)