Suebee herself created the mix because of a dearth of lab blocks in her area. She actually recommendeds quality lab blocks if you can get them over her mix. You must follow the ingredients very closely to get the optimal nutrition and watch for the optionals like dried fruit.
Since I cannot get Harlan now, and have never tried Oxbow due to the expense, I am stuck with Mazuri 6F. Its 16% protein and comes in 50 lb bags.
Btw the mazuri you get in those teeny bags at PetSmart are actually the 5663 formulation and are 23% protein. Still better than Kaytee, Sunseed, etc...but just so you are aware.