DS-1 by itself gives nice warm distortion and modded it can possibly bring DS-1 close to stonger distortion territory to say DS-2 (which boss calls turbo distortion)
Among the Boss pedals out there the OS2 seems to be the least popular apparently the DIST/OD Blend knobs confuses alot of users out there. Yet it came to my surprise that the OS2 is Paul Gilbert's fav drive pedal! Go figure! Hmmm...