I have not purchased an rv from them but on three different occasions needed parts for my Mobile Suite. All three times they had the parts in stock and they will not be undersold if you have priced elsewhere for a reason, such as distance. You will find other repair places purchase their parts from Lazy Days. The lazy days I had experience with was in Tampa Florida. From my personal experience if you need parts in a hurry then they are the place to go. They have a computer program covering all parts from all brands from what I've seen. If they haven't got it overnight UPS.
Lazy Days is very competitive and, as I recall, is the largest dealer in the country. I haven't heard any bad on them. Heck, they even have heir own TV show.
Bought from the Tampa location and recently looked at another. I was satisfied with the sales (super salesperson) and the service end, also. I went back for a couple of appointments and was very satisfied.
The Tampa site is huge, and is run like an assembly line. From the moment you walk in the door until the time you drive out with your RV, everything is carefully orchestrated, planned, and executed. They do have a good selection and displays, but I would rather find a small local company. I don't think their service is exceptional.