I have a DC-3, and have had it for years. These are really great little amps. As the previous post indicated, they are extremely versatile. The amp in stock condition will probably not give you the extreme heavy sound you are looking for, but there are ways to achieve that sound.
Of course, you should definitely try before you buy, but if you decide you like the basic tone and feel of the amp, after you've played it for a while, you can do a complete re-tube. The BEST advice I can give you is to go here https://ssl.eurotubes.com/index.htm
Bob, who owns and runs this company, will hand select the tubes you need to get exactly that sound. He even advertises a high gain re-tube set for the Petrucci/Satriani sound specifically for the DC-3.
The amp is pretty basic. It's a straightforward 2 channel amp. The clean channel can go from a very reasonable tight clean sound all the way through a fairly heavy break-up. It can do this because it has a separate gain pot for this channel, and the mid-pot also acts as a gain stage above the middle settings.
The overdrive channel is voiced very nicely, and will definitely get you into high gain territory no problem if you are using humbuckers. It even does a great job with single coils.
The real sweetness of the amp, however, is the graphic eq. With this you can really dial in a great sound. I use it to boost the lead, as do a lot of the guys on here who have this amp.
It runs extremely hot, and if you are playing with any regularity, you'll be burning through your tubes every 12 months or so. (Your mileage may vary, of course).
The amp does tend to suffer from a small amp sound in larger rooms, so your options with that are to throw a mic on it, or run extension cabs. I have run it through 2x12's and standard quad cabs, and in both instances the amp becomes a whole different animal. It sounds HUGE if you run it trough a boogie quad, and does very nicely also through older Marshall quads (with v-30s).
If you do get a chance to try it out, just plug in, run it in the drive channel, engage the eq and dial in a scooped V, and run your gain at 8-10. Put he tome controls at 5, and do maybe a 2 or 3 on the presence. THat will give you a really decent idea of what the amp is capable of doing. You will be amazed how loud it will go.
All in all, I love mine, and I would highly recommend the amp. Hope this helps.