I've talked to dentists who sold to DSOs and are thrilled. I've talked to others who feel like they got played. The difference isn't usually the DSO itself -- it's whether they understood what they were actually agreeing to before they signed.
The question isn't "DSO or no DSO." The real question is: are you comparing all three options with the same level of rigor? Most dentists I meet have only gotten one type of offer and are treating it like a binary choice.
If you're sitting on an unsolicited DSO offer right now, my advice: don't respond yet. Understand your EBITDA. Get your practice appraised independently. Then put yourself in a competitive process -- let three DSOs bid, not just one, and get a private sale comp to benchmark against.
The dentists who walk away with the most are the ones who created competition. Every single time.