Lower End Tube Testers: which are worthwhile

Any help in this area would be appreciated. Of the lower cost decent testers (Hickok 533, 533a, 600, 600a, 6000, B&K 707, TV7) - which are the ones to hit and which are the ones to miss? I heard that the Hickok non "a" model's don't test 6922 family tubes - is that correct? Finally, anyone know anything about Stark testers? They were made by Hickok, or using Hickok designs. Thanks.
There are a number of worthwhile testers other than a $1000.00 Hickok 539c if you know what information you wil receive.

Almost any tube tester (rather than an O'scope) will NOT give tube traces or test at actual use voltage. What you WILL get is a reliable indication of whether a particular tube is DOA. Further, and most important, even a lower cost tester will enable you to "match" numerous tubes to each other, even if not particularly accurately to some exact standard. Do not underestimate the usefulness of this later benefit. It is at least as important to have tubes that are not wildly out of sync with each other (especially in a push-pull pair)than it is to know whether a particular tube is at 95 or 98% of spec.
Most testers will test 7-9 pin mini tubes such as the 12xx7, or 6dj8.

I have had good luck with the Eico 667, and the B&Ks such as the 606 or 700 for inexpensive testers. The B&Ks are particularly easy to use with their multiple sockets.
I own a Hickok 600 and so far I have not found any tube I cannot test on it including 6DJ8/6922. The roll chart that came with it does not have these listed, but you can get updated roll chart data off the web. These are really excellent, just make sure you get one that is in good condition and you are sure is well calibrated. Here are some URLs for you to look at:

I love my SICO (superior instruments co). It doesn't do what my b&k did but is much easier and quicker to use. All I need to test for is tube strenght and shorts. I'm not worried about matching for transconductance......