Reviews for Simmons Beautyrest mattresses are generally mixed. Reviews on SleepLikeTheDead.com, ConsumerSearch.com and Matress-Advisor.com indicate that this line of mattresses has good motion isolation, but is susceptible to premature sagging.
Simmons Beautyrest is a line of mattresses that encompasses a number of mattress styles and designs. Certain Beautyrest models may be of better quality than others. Most Beautyrest reviews cite the wide variety of mattresses as a positive feature for the line.
The same reviews note that many mattresses in the Beautyrest line sag and lose support relatively quickly. The company's warranty period is short and does not offer coverage for these issues.