Lull ships directly from factory to your door, cutting out the middle man. This allows them to offer a quality product at a significantly reduced price. The Lull mattress is one of only a few that I’ve tried that is good for sleeping on your back, side, and stomach. Most mattresses will be great for one or two positions, but having all three is great (especially if you and your partner sleep in different positions).
Memory foam mattresses are becoming more and more popular, and for good reason. They offer a great support/comfort tradeoff, and I would definitely consider Lull to be top tier in the category. The mattress is a bit firmer than average, and made with high quality foams, so it will provide good support to address back pain.