Never liked the looks of the MUDD 0500 and passed on quite a few of them.
Even sold a MUDD auto that I got direct from G&G. Thought I sold it for a good price at the time but I obviously sold it too soon. LOL!
On the other hand, I really like the 0400, I've got both of the variations - PE & PS.
Fact is, the only ZTs that I like anymore are all older models. I've got 40 of them, including the 0400's.
Nothing new that ZT has released in the past couple of years has come close to compelling me to buy it, either because they are too small or unattractive to me (eg., 0022 & 0223) or just a variation of something they've already done before (eg., 0308).
But the fact that I know this means that I'm still looking and hoping that ZT will come up with something better that lives up to the reputation that it built up in the past.