is the undertaker choketube any good?

You typically get what you pay for. There are two versions of the undertaker choke tube...the one that can shoot hevi-shot and the one that can not shoot hevi-shot (the cheaper one you find at wal-mart). I would spend just a little bit more and get either a Primos Jellyhead or a Tru Glo Strut Stopper Xtreme. Just my two cents...

my dad has one and loves it, depends on the load and gun your shooting though

I've got the lead shot version. I'm very satisfied. My standard for a good turkey pattern is 20 hits in the head and neck (not the kill zone)at 40 yd. I get that kind of pattern with 3" Win. AA #4'sor HV#6's. The new Win. x-tended range shoot even better.

I have the hevi-shot model and with the old Rem. hevi-shot in my Win. 1300 it is much better than any prior lead loads with the old factory full choke. I don't care to shoot beyond 40yards or so and I had a reliable 35 with the factory choke, but now have an excellent pattern to 40 and around 100 pellets in the 10" circle at 45yards. Many people on this site have posted much better results with higher quality equipment, but I found the undertaker helpful at a good price.

I got a hevi-shot model in my Benelli SBE, I tried many different tubes and this one worked the best in my gun.

I have the lead shot choke that patterns my 6's very well. Does it work? Well, it shoots turkeys dead so I like it.
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I've got the Hevi shot version... And it patterns the Winchester Extended Range loads pretty good at 40 yards... I get about 12 vital hits at 40

For the money, the undertaker is a good choke. I now use the Jellyhead, but I've killed several with the undertaker and Rem. hevi shot.

I have the regular one and average 122 pellets in a 10" circle at 40yds using 3" Winchester Extended #6. Nice even pattern in the circlearound the perimeter of it.