In tech, the consulting industry is full of "job half done poorly". Consultants overpromise and underdeliver. They take the money and run. Yes, it somewhat works. If you have a bug, no one can help you because their code is a giant ball of spaghetti that requires a Rosetta Stone to decipher. Which they will not give you without you paying more money. Within five years, you are likely to ditch that train wreck and hire a bunch of new consultants to rewrite what will probably be another slow burning dumpster fire.