Scott, I love Dimension Strings. They are more complex and detailed than the average person will need for a little sweetening, but if you want über-realistic orchestrations, they can't be beat. I have used them on some pop and indie-folk stuff and they were great.
A few points for those considering the purchase:
1. You really need to budget enough for the Vienna Instruments PRO player: the standard player can't take advantage of all the DS options. PRO offers enough functions to make it a good purchase if you use any Vienna libraries. I was annoyed at first because the sales people did not make this clear, but I am OK now and glad to have the PRO player.
2. You can either set the Pro Player to load all the articulations when you select a patch, or you can set it so you have can load only the articulations you think you need. Loading all the DS articulations takes a long time on my machine, and mine is pretty powerful. If you load all the articulations, you should have a good bit of RAM on board.
3. I try to keep the same articulations mapped to the same keyswitches in all my projects, even if it means having some empty cells; otherwise, I would go nuts trying to remember which keyswitch does what.
4. If you buy DS, load it up, and play a single note, your first reaction may be: "OK, that sounds good but not that different than my other string samples." Don't freak out. When you start using DS, taking advantage of all the articulations and options, and realize all the different possibilities of using anywhere from one to eight violins, you will be amazed at the realism. You can go 60s "To Sir With Love," Moody Blues, disco strings, chamber music—whatever.
5. Although DS only has eight players, it can actually sound symphonic and is much richer than the chamber collection, especially with judicious use of the humanize feature of the Pro Player. It also makes a good choice for 2nd violins along with your orchestral patch. For string quartets, try two of the violins from DS along with the viola and cello from the solo string library (until DS releases the viola and cello collections!).
Sorry for the long post, but this is a big purchase for most people and I want you to be informed.
FYI, I have the old VSL Special Edition and Special Edition +, which means I have the whole orchestra with most articulations, sampled every other half step. I also have the full Hollywood Strings library (I think the big one is called Diamond), and some good external synths. Nothing is as real as DS, although, in fairness, Hollywood is a completely different sound. I find Vienna more pristine than EastWest, which is neither good nor bad.