Alamo's Dynojet is just fine, in fact many big race companies choose to tune there. It's funny when people go out and have their car run on other less accurate equipment, and they complain when they find out that their car is slower than they thought after using Alamo's Dynojet.
Ive seen alot of dyno owners play with their correction values to make their shop seem like its tuning is making more of a impact than the other shop. Alamo's dyno readings are always less than the other guy for a reason, accuracy.