Yes, eating in front of you can be a good sign, however, an animal that feeds isn't necessarily a healthy animal.. While feeding is important, I think it is very important/necessary to look for a properly hydrated animal, ie. no hipbones, skinny tail, skinny body, etc. It is also a plus to have an animal that you can visibly see drinking(when misted; mine rarely ever drink from a bowl).
A healthy animal should be alert, and wary, of good weight(most of which is due to proper humidity), and feeds.
As for the superworms, sure, you can feed them superworms, as they are for the most part insectivorous in the wild, according to reports. As for my animals, they never cared for superworms, so I discontinued feeding them. I just find that feeding rodents is much more convenient for me, as I buy several hundred at a time, keep them in my freezer, and simply thaw them out when it's feeding time(everyday). With insects, if you don't want to be making trips to the store, you have to keep them alive in between feedings, which is a separate job in itself..especially crickets...sheesh.. It is also my opinion that mice provide a much more balanced diet than insects do, and I have found that my animals that were fed on a rodent diet grew faster, and put on weight quicker than animals who were fed insects, or a combination of both. But then again, this is just what i've seen with my animals, and by no means represents the whole......
As for sexing, this can be rather difficult in tree monitors, and has proven to be extra confusing for me with V. beccari..oh, how many times i've been fooled.....hahaha.. I guess the most accurate way of distinguishing between the sexes is if it lays eggs, then you'll know that it is not a male..hahaha.. Some secondary sex characteristics that is sometimes exhibited in males, is a larger, broader head, larger overall size, and the shape of the tailbase in cross section is triangular, as opposed to a female's tailbase being circular in cross section...However, like i said, this is not set in stone, and I have seen plenty of individuals that disprove this theory to some degree.. Although even more inconclusive, males will possess hemipenes which is sometimes everted..this is misleading because females will 'pop' an appendage out as well. Males will also only sometimes evert the whole thing, where most times the hemipenis is not completely everted, which can confuse it with a female's hemiclitoris. You can see a pic of a fully everted black tree monitor hemipenis if you scroll down in the forum a bit...i posted a pic of one of my male's a few weeks ago...I would not go by this method however to sex your animal, as it is probably one of the most confusing ways....
Cheers, I hope this helps, have a good one...
take care,
bob
The ODatriad 
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