Anecdotal input:
When I was re-doing my kitchen in my last house, I stripped things down to subfloor and studs. I moved gas lines and water lines to completely reconfigure a kitchen layout that had last been updated in the 50s. I wanted a whole custom setup.
First stop, IKEA. Incredibly knowledgeable, highly trained, and the range of cabinet styles, colors, and doors were like building a custom car using parts-bin shopping. Got a price and left, noting that every single piece was in stock. It is super easy (with a little research) to compile a complete custom kitchen from items they have in stock.
Second stop, HD. Also very knowledgeable. Much smaller range of sizes and finishes in stock meant definitely a custom setup. I got a price which was nearly triple what IKEA quoted. When I brought this to the attention of the HD associate, he quietly pulled me aside and said "don't even think twice, get cabinets from IKEA." He cited that they do use particle board (as do most over-the-counter cabinets) but they carry a 15-25 year warranty and they are the absolute best composite cabinets available.
Third stop, Lowes. Pretty much copy and paste exactly what the HD designer said. She had actually worked for IKEA in kitchen design and gave me some inside info. The [insert brand name that I forget] hinges and drawer sliders IKEA uses are highly coveted. KraftMaid has been trying to get this hardware for decades but [the brand name] refuses to sell them to anyone but IKEA. She said I would be an idiot to get KraftMaid over IKEA and cited that I would be getting a better warranty, and 95% the quality for one third the price.
Long story short, I got my entire kitchen through IKEA.
I also contracted through IKEA to get the quartz countertops (third party) and it was a far better price than any of the local shops I called. There is a wee bit of frustration having to assemble everything yourself. It gets tedious, but the whole thing went together flawlessly and I loved the end product.
On a sidenote, in the entire truckload of boxes, I had one mistake. Of the hundred or so boxes, they accidentally pulled one brown drawer front instead of white (which they happily exchanged). I was impressed when it was all done, I didn't need to call for missing screws, exchange damaged pieces, or ever visit the store again (except for that one exchange). Complete package done right the first time. I was impressed.
The only reason I didn't do it for this current kitchen project is because I was just augmenting existing cabinets, and they had come from HD, so I just added a few more HD cabinets to match what was already there. I did use IKEA kitchen pantries to make my closet in the master bedroom, and my coffee table and end tables are IKEA as well.
Can you tell I like IKEA?