Unfortunately, you get what you pay for. Do not leave it in the rain, the roof will split. If you're ready to make reinforcing adjustments, I might suggest that you build your own.
I've had it less than 3 years and kept it on my covered deck in the winter. Every time I move it to the yard in the spring, I'm reminded to fix the split flimsy framing to remove the wobble. 
I'm presently on my way to buy building material to redo the roof (which I will extend) and reinforce the flooring. 
The "Premium" is in the look only...