I have a SD booster pedal and it is FANTASTIC! I figured more people here would have them but only a few of us do, I think it's due to the fact that there are no sound clips showing what it is capable of.  As far as it being built well it's heavier built than any boss ibanez pedal.  I haven't had any issues with it except for the noise of it moving when my amp is cranked.
I use my for a solo boost when my amp is cranked...however when I'm at bedroom volumes I use it all the time to increase the thickness, harmonics, sustain, and overdrive of my amp.  
This thing doesn't color sound in the least it just gives you more of the same.  I don't like using a TS9  or od-1 or 3 they DO color your sound in my  opinion.  
 Don't hack it till you try it.
If you have any questions about it shoot I'm all ears.
Luke