I did not know Serta had a hybrid series in their offering, and after 15 years of sleeping on a Simmons Beautyrest firm mattress, I discovered true sleeping joy in the Serta iSeries 500 Cushion Firm mattress. It was my perfect compromise between firm (needing more support) and plush (desiring cushioning and comfort). I cannot believe I put my body through the injustice of sleeping on a mattress that no longer provided support, and certainly as a firm, had little comfort/cushioning compared to what I have now with my new iseries 500 Cushion Firm! The hybrid is exactly what I was looking for but could not articulate! I love the mattress construction, feel, height and depth. Thank you so much for coming up with sleeping solutions to meet complex physical needs, and for doing your homework to bring an excellent product out to the market! Wow I am impressed. Everyone is trending with the foam mattresses and I am sure they are great for some, but for those who need solid reliable back support to maintain correct alignment, while also relieving pressure points and providing a cool sleeping solution that is soft to the touch--I give your new Hybrid lines A ! Well done! I did go and try out the Simmons Hybrid line, and I went with Serta because the comfort was just what I wanted and needed. I can sleep well now, I have no pains, no aches, and finally--FINALLY I can sleep well again! I am so happy I went with this purchase. I know its a mattress, but when you have a real need and it is met in every area that counts, nothing can replace the pleasure, enjoyment and joy of experiencing true restful sleep night after night. Thank You Serta! You have restored my comfort in resting, you have a new customer for life!