It really is amazing.
WOW. Lived with this bad boy for a week now, and have nothing but good things to say about it.
Let me put it this way. The major draw of the DT series is supposed to be that it sounds amazing with a POD HD-series plugged in. (Spoiler: it does.) But I spent the first four days I owned the DT25 just playing the amp as it came out of the box - no effects, no POD, just a guitar plugged straight in. My POD HD500 stayed in its road case until the fifth day. It's THAT GOOD.
It's nothing short of amazing as a standalone amp. If you've ever wondered if there was going to be a product that fused the best sounds of the major ampmakers, you've found it. The clean is Fender Blackface clean; the crunch is Marshall crunch; the chime is Vox chime; and the high-gain is Mesa high gain, all with tube authority and a ridiculous amount of volume on tap, No, seriously. Take the Master up to nine o'clock and it will punch you in the face; take it up to twelve and it will rip your face right off. I won't spend this review rerunning how decibels work, but unless you're playing a gigantic club or stadium without a PA, this has all the gain and punch you'll need. It sounds great plugged into the matching DT25 cab, into my existing 4x12, into a Seismic 2x12, you name it.
So, with the POD plugged in, you get a whole other level of ease of use and sonic variety, and I could go on and on about that, but I won't. I repeat: this is an outstanding amp out of the box, regardless of whether you own a POD or not. Jacking in the POD just adds to the experience. It's icing on the cake. But I may or may not ending up playing it with the POD. I may just play it as it is, and that leads me to the half-star deduction.
So what's the half-star deduction for? The footswitch. Or lack thereof. Line 6 doesn't include one in the box. Switching via the POD will do footswitch duty for you, of course, and you can certainly pick up a TRS one-button footswitch for cheap. But for the price, they should've tossed one in. Yes, I know that's a marketing decision, but still. Come on.