"Loud and articulate + good distortion for metalheads!"

Feature:
Tuner is handy and accurate. The power squeeze function cuts down the volume, compresses, and adds some bass, so that even though it's quiet, it still sounds full. Sometimes I prefer just turning down the volume instead of using this. Speaking of which, the knobs here are active not passive, and the effects/volume increase incrementally rather than smoothly. Some people might get annoyed by that, but it's not too noticeable. Packs in a lot of features though overall. The similar VOX amp has better control over effects, so I'm giving the cube an 8/10.

Quality:
Like everyone else says, this thing is built like a tank. Yet it's also relatively lightweight and compact for a 30 Watt. Probably uses a switching power supply. Metal grille in front keeps you from kicking in the speaker better than the meshes of some other amps. Sturdy and solid, quality parts.

Value:
Good value alright. Reason? Because its sound and features compete with amps two or three times its size. I like saving space, and this here is good enough to practice in a band and do small gigs without breaking the bank or my arms. So its a bigger more expensive amp in a smaller form factor and lower price.

Desirability:
It looks made-for-heavy-metal. The grille on the front is matte gun-metal in color, the rest of it is textured black. Sex appeal mainly for girls into guys who wear leather.

Sound:
Incredibly loud for its size - need earplugs for anything above half volume, and above that the sound still stays accurate. So this amp sounds good everywhere on the volume dial. Bass is somewhat boomy, but the onboard EQ takes care of that. JClean channel (the plain channel) sounds very accurate and clean, while the Acoustic setting removes the pingy twang to create a warmer and brighter acoustic sound. Since I play metal, the only other amp model setting I use besides these is R-Fier, which is heavy yet articulate. Compared to a Crate, it is less muddy but has more bass, and is closer to the smooth heavy buzz of a Boss MetalZone than the grungy grating of a Boss Distortion pedal. Somewhat of a Metallica "Black Album" or Pantera rhythm guitar sound. The pinch harmonics on R-Fier sound loud and clear as a bell. This setting alone makes the 30X worth it for me, at least a 9/10 on sound there. The "metal" setting sounds like Iron Maiden or Judas Priest, if you like that sort of thing. More mids, less sharpness. The other amp models are probably good for classic rock, jazz, and blues, but I don't much care for those styles. I use a Schecter Damien 6 and the switch/tone controls on the guitar plus the double humbuckers bring out the potential of the sound and features of the Cube 30X. Effects are okay... they do their job. Chorus and Reverb are decent, at least as much as they can be on a mono speaker.

Ease of Use:
Straightforward to use. Only thing I had to look up in the manual was using the chromatic tuner, which involved holding down the button for a second until the light blinks. The rest is intuitive.

Support:
Haven't used it yet, but from the product registration form information and what others have said, Roland is great.

Overall:
For a solid state amp, there is no better. The 30 Watt VOX is comparable, but a bit more bulky than this thing, so if you add up tone + features + size, the Cube wins.