I have owned 2 370Zs and my current Z loved them all. No issues for the time I owned them. The rear latch opening from the inside same issue I just get out and open it. Lots of fun.
Build quality on the Z is very good for the money. The BMW requires some careful consideration on cost,cost,cost. It's the price you pay for bragging rights I guess. Like a Rolex not the best watch in the world but most people know what it is. I prefer my Breitling's and my Z. Have a great week!