I've put a Conestoga kitchen together from scratch. Make absolutely sure the boxes and frames are 100% square and fronts are on flat or your installer (myself in my case) will not be a happy camper. They say you don't need clamps... Buy The Clamps. Screw uppers together on the ground if you have wavy walls and then put it up. Pre-drill your holes.
If you use the 'design' service through the online cabinet company, I found them more of a 'layout' service. In hindsight I feel an actual kitchen designer who has done this before would have done things differently. Things like gaps that are different sizes between cabinet doors that just don't look high end when you see it, doors that hit other cabinets or the wall, pointless extended stile cuts, etc. They made the microwave cabinet a built in (you cut out the face frame hole) when I had it in black and white it was not a built in microwave (pre cut normal face frame). Luckily I caught it on the parts list because I had watched all the videos 2x even before I ordered. Maybe it just depends who you get. (Pro Tip, there are little plastic bits that you can install to your hinges to limit opening, which I found out myself later).
I had lots of shipping damage, which they did take care of with pictures and no issues. The large pieces were hanging off the pallets, so these fragile pieces of wood (granted in heavy duty cardboard) would take the full brunt of anything they ran into being shipped across the country instead of the corner of a wooden pallet. One pallet was stacked so high and wobbly like you would only see in a Dr Seuss book, I couldn't believe it. Maybe it fell apart and the shipper tried to repack it, badly. Only much later putting on doors did I realize a set of SOSS hinges was missing. I know I didn't lose it because everything was kept in the hardware boxes that only I had access to, and I ended up with an equal number of extra Blum hinges with no home, so somehow they got switched at the packing stage, so that was an extra $25 or so. They might have replaced them but it had been awhile since I had ordered at that point so I just got them online.
Go with the nicer options for details, you already spent 9k on a kitchen, spend 1k more to make it look like a 40k kitchen instead of a 20k kitchen. Seriously if this is your main home do this. Get the false door sides, etc.
The special paint is good, but it's not impervious like my parent's (some kind of laminate?) cabinets. If you leave something on the paint, it's going to leave a discoloration, even if you just rub it wrong with a damp soft cloth there will be a shiny spot that doesn't go away.
To give you advice it would help to know the price difference between the RTA and a comparable pre-built kitchen you are looking at, and I'll let you know my opinion if it would be worth it, based on what I know now.
Q