I have students in the Freestyles and my own daughters wear them as well. The Jackson Freestyles are for the recreational freestyle skater, not someone who's just skating circles around the rink. They are more stiff than the Classiques, which are the top-of-the-line rec skate, and definitely more stiff than the SoftSkates. (I thought someone here said the SofSkates were sized slightly different, but I could be wrong.)
The Freestyles are higher quality than the lower models and the boot is cut to allow for knee bend and toe pointing. Adults don't outgrow their skates, so without any jumps, the boot will last a good time. Good skates really are an investment for Adults.
The stock Mirage blade on the Freestyle boot is challenging. I have a student who changed from Riedells with the "Sapphire" rec blade to Freestyles with the Mirage blade. The blade really was difficult for her to master, especially with only skating a few hours each week. The blade rocker is much more prominent on the Mirage, and she felt she would trip or go over the toepicks and face plant.
If you're not doing any spins, turns or crossovers, then these aren't the boots for you. Jumps break down boots more than they break them in. Crossovers, dips, sit spins and spirals help break them in and it sounds like you're just going to skate forward in circles without even edges or turns.
I would suggest the Classiques - they'll last just as long, save you some money up front, and most of all, you'll be able to break them at your current skating level/skills.
Good luck.