I have, they're great. Mine was very calm and "deliberate", not jumpy like some of the Asian/Indo monitors you see in the shops. Very strong bite, you DO NOT want to be bitten by a dumerili...they eat mollusks and crustaceans in the wild and have strong jaws. Mine ate mostly rodents with occasional insects and fish. They will climb a little, give them some low wood to climb up on, but more important is deep substrate as they love to burrow. They don't need a swimming space, but they enjoy soaking, and mine always crapped in the water pan. Also recommend wetting down your substrate for added humidity.
I gave mine 80F ambient temps, 90+ on the hot end with a maybe 105-110 basking spot; if the spot was any hotter he didn't use it. I used a crude Retes stack type basking platform for him and he often hung out under it. He lived in a 8x4x3 enclosure and that seemed to be plenty big enough.