I replace 1 meal a day (dinner), 5 days a week with Queal, since about one year. I have never experienced any issue, it is great for my needs and despite the roughly 40kg of Queal I have eaten this far, I am nowhere close to being bored by it (the 7 different flavours help here). I have checked my blood twice and everything is fine (some values improved after some months of Queal, I'm not sure if this can be attributed 100% to Queal, but I think it helped).
Also, I am not at athlete, but I work out two or three times a week, and I recommend the Active version that makes it easy to figure out the right amount of powder needed for a meal that will not let you hungry. Sometimes the regular version is not enough and I find myself eating almost half a bag of the regular version.