If you are going in soil it might be ok... But It isn't your best friend...It is more like a cheap hooker that you know you probably shouldnt do but you cant resist the price. If you are growing in hydro then imagine that hooker has several STD's. I used miracle grow outdoors a few times when I was younger and as long as you are careful you wont F any of your plants up, but you wont get the best results, or as good as you could with better (more expensive) nutes. It all depends on you, and what your goals / hopes are. Good luck!
Miracle Grow is not the best I have encountered: They are so cheap, I tried long while ago: Even with quarter strength of recommended dosage, it ended up burning the leaves. Flushing with distilled water did not stop nut burn. Currently there are so many good organic fers/nuts are available in the market. It will be expensive, but consider you will be using very little of it each time (like one teaspoon for a gal) it lasts longer. Moreover, there is very little nute burns. Just start with half or quarter of recommended dosage and slowly increase the amount: you will be pleasantly surprised! Good luck!