I've never had a soft cab and I think I'm going to add one to the Rmax 4 LE that I'm buying. I have very high confidence in the Yamaha soft products from my using the back panel on my Gen 1 - it was very durable and fade resistant. I'm really thinking about the SXS enclosures version based on their fast removal of the side panel and slightly cheaper cost. That just looks like a really slick design to me. I also really like supporting small business. I don't want to buy the Yamaha back panel if I end up going another direction for the sides. I have no doubt that the Yamaha side panels would function just fine but think I would get better airflow with side removal. If I buy the Yamaha version, I would use @MassiveOverkill 's pinch between the door panel installation method to alleviate damaging the doors. All input appreciated.