It's the heaviest bass I've owned since the long scale LPB-3 I had a few years ago, but unlike the LPB, this one sits perfectly and doesn't feel weighty at all, because of the short scale. All of the weight is in the body, so it doesn't feel any heavier than a 3.5kg Fender.
Of all the short scale basses I've owned, this one has the best E string of any of them. The E on a lot of short scales sounds woolly and undefined, but this one just booms, and handles attack really well.
The control panel is really cool, although I don't see myself using the 3 way varitone selector in other than the "normal" setting - the "bass boost" and "bright" settings aren't "me" - having said that, the bass boost would be quite usable with round wound strings I imagine. The HI-LO impedence slider will be useful if I decide to use this one in the studio next week. The phase selector is a great thing to have too - it only operates when the pickup selector is in the middle (ie. both pickups on), but it really beefs up the overall fatness of the output when in the out of phase position.
A guitard mate of mine in the audience said the Triumph sounded great, and I was really happy with how playable it was live. The honeymoon period isn't over yet, but so far so good!