Just starting construction tomorrow on mine. I used BYOP. Take a look at my build thread (link in signature) to see how things have been going.
While they have been ok to deal with you pay a lot for their design drawings. When I signed up it was $2,995. They do offer guidance and suggestions but it is mostly what you want. They produce a construction drawing, permit application drawing (one for the pool and one for gas), drawing for the HOA, and a layout drawing. They are available for general consultation throughout the process and that has gone just ok.
Working with BYOP's equipment supplier partner was a bit laborious going back and forth as I tried to figure out my automation. Ultimately, they beat a competitors equipment pricing for a "FULL ORDER" (not piecemeal like a pump from here, filter from there, etc.) and increased the equipment manufacturers warranty to 5 years. They also provided a good list of contractors as a starting point. You still have to handle all the interactions with the contractors, evaluation of their quotes, vetting them, and coordination for the construction.
