Is the Daisy Bay Plush good for side sleepers?

It is aimed at back and stomach sleepers who want firm support. Side sleepers usually need more give at the shoulder and hip, and this firm pillowtop may feel too hard there.

How does it compare with a foam mattress?

It uses an 825-coil innerspring core rather than foam, so expect a firmer, more responsive surface with more bounce. Foam tends to contour and isolate motion more; the coils here are designed to limit motion transfer but won't match memory foam.

What do the cooling and support upgrades add?

The cooling layers are meant to help with temperature regulation, and the reinforced support system is aimed at durability. Both are optional additions on top of the standard build.

Does the queen size fit a standard bed frame?

It is a queen mattress, the standard queen size, so it fits standard queen bed frames and foundations. Check your frame's weight rating for an innerspring mattress.

Is it a good fit for couples?

The coil core is designed to minimize motion transfer, which helps when one partner moves. The firm surface suits back and stomach sleepers; couples with very different firmness preferences should weigh that.