This Orange amp has awesome british overdrive tones but lacks a usable clean tone. The amp has a 3-band EQ, a master volume knob, and a gain knob. It also includes a half power switch if you need high gain at lower volumes. A great feature of the amp is its effects-loop. Overall its a great amp for driven tones but needs a better clean tone.
I've previously owned both the Tiny Terror and the Dark Terror, and neither holds a candle to the OR15. This amp is far more versatile and organic sounding that either of those. Tons of gain but with a more vintage flavour to it.
I play metal, mostly the kind that would fall under the sludge/doom banner but I do play other styles as well and this amp handles all of them quite nicely. Loads of saturated organic gain on tap, in fact far more than I need in most applications. I don't see a lot of reviews that judge the OR15 as a metal amp but for the kinds of metal that I play it absolutely nails it.
What I love the most about the OR15 is that it sounds equally great at both bedroom and rehearsal levels. For the most part I use it at home through a Mesa Recto 212 with Vintage 30's. I use the 7 watt setting with the volume at about 7:30 (quite low, I live in a townhouse) and the gain around 1-2 o'clock and in this setup it absolutely sings at a volume that won't annoy my neighbors. Not many tube amps that i've tried can sound great at this volume but the Orange absolutely nails it.
Outside of my home setup, I have used the OR15 numerous times in practice fully cranked on the 15 watt power setting. At full band volume using the same Recto 212 in a small room competing with drums, bass and another guitar this amp has plenty of volume and doesn't struggle to keep up with larger watt amps. I have also used it in a much bigger room through a Randall 412 with V30's when my 100 watt head was in for repairs and it did struggle a bit in that setting, but it was enough to get me through the night without making the other guys turn down too much. On stage and properly mic'd I don't see any reason it wouldn't hold it's own against any other higher wattage rig - though I haven't tested this yet personally. I don't tour but if I did I wouldn't hesitate to bring the OR15 along as a backup.
If you're playing a gig with a PA and mic'ing your guitar cabinet, 15W is all you need, especially for smaller venues. It'll lower your stage volume, which will make the mix sound better to the audience. Plus, you'll be able to crank it and really get things saturated if you want. This sounds massive. I use this for stoner and doom metal, ,and it does the job spectacularly.
Seriously. Remember that scene from Indiana Jones. You know the one. Where they open the ARK and everyone's face melts off?
This amp is like that.
I run mine through a Marshall cab with two 12s - a 1936 I think it's called.
Sounds terrible with fuzz or other distortion pedals. You don't need them.