This isn't 100% on-topic, but I thought I'd throw out my experiences. I'm a 2008 graduate, so I'm definitely a newbie, but I have dipped my toes in the waters of both retail and private practice.
I work part-time at an established private practice with one other OD. It's not sooo high volume that it can become a two doctor practice overnight, so I am part-time there until we build it up. In the meantime, I am working at a JC Penney Optical (US Vision) part-time to pay the bills.
I was fully prepared to loathe the Penneys gig. But really, it hasn't been bad at all. They don't tell me when to work, they don't tell me how long I can take with my patients, and I'm not pressured to sell anything. The opticians don't have to be licensed, but I'm very fortunate to work with three very sharp, knowledgeable ladies with years of experience. My exam is the exact same both places.
I do have a handful of complaints with Penneys: I don't like not having a field machine. That is the biggest difference between Penneys and the private practice (though, truth be told, after I'm a partner in the private practice, I'll definitely be looking to invest in a better one, among other things). Though for screening purposes I'd prefer the GDx, which neither practice has (yet).
As a new doctor just starting out, I probably wouldn't be able to afford all the great (but expensive) ancillary equipment right away, regardless of practice modality. But I
would look to add it bit by bit. If I intended to stay at Penneys, I would look at purchasing some of this stuff to use there, but it is only temporary.
As for building my reputation as an eye DOCTOR in this town, it helps that the OMDs here are, for the most part, GREAT to work with (there's one OMD office that steals patients, but pretty much no one refers to them for that very reason). They know what I'm trying to do with the private practice, and they understand my limits at Penneys. I'm still able to treat the red eyes, dry eyes, etc. I send letters to all my diabetic patients' GPs/endocrinologists, which seems to impress my patients big time (I was surprised at this...I really thought it would be more commonplace), and hopefully, it will send a message to their physicians as well.
The only other real beef I have is one day I got a notice to throw away all CL solution samples other than Complete and Boston. Because they have some kind of agreement with AMO. I promptly threw this notice away because it's not their business to tell me what to give to the patients. I told the office manager what I was doing because I didn't want HER to get in trouble, but she didn't mind at all.
EDIT: Got a revised letter stating that the solution thing was meant for optical, and the doctors can use whatever they want.
I think I got pretty lucky with my retail experience, though I look forward to the day I am at the private practice 100% of the time. I feel like I'm really on the same page as that doctor. I'm sure all the private docs here have a lot of integrity, but after one of my rotations in school, it's not something I take lightly. I was temporarily put off by private practice when a private OD (just an example) would make patients believe they NEED new glasses when nothing has changed about the SRx except a 3 degree axis shift when they have -0.25 or maybe -0.50 diopters of cyl. But of course it doesn't have to be that way.