I have used MYKE Pro and I love it. ...although this is my first year with it. The plants I used it on really seemed to do well. I didn't do any comparisons but the ones I used it on grew really vigorously and did well without any ferts. I was amazed how fast some of my little shrubs grew...started from seed in the house and used the MYKE on planting out and they just exploded...
I do not use it at seeding time though, I use it when I plant out those seedlings. I spread it around the rootball as I plant them so I know it is in contact with the roots (and the roots are actively growing).
I have mostly used it on the shrubs but trying it on my flowers is a good idea...just didn't think of that last year...
I'm a big fan of microbs. Some soils have lots naturally but if your in a new house I think you are starting from scratch...subdivision builders do not care about anything living, let alone the soil microbs so they are likely all gone due to the way things are done...If you have a long term, organic garden with constant plant cover I think you should have many natural microbs happily living. (always keep a cover crop will help sustain the microbs...they need the plants as much as the plants need them!)