I live in Michigan and supply building materials to builders and homeowners. I like many of the brands but here are some things to consider when looking at composites.
1. Most tend to scratch very easily (One that doesn't is Azek
) I retail for about $3.00 per foot
2. Most tend to stain easily (Once again Azek doesn't) I have left motor oil on this and it doesn't stain.
3. Composite products can become quite hot to the touch in direct sun light. (No answer for this)
Another product I recommend is Timbertech
Good rule of thumb, stay away from the stuff in the big boxes (Lowes, Menards and Home Depot) more wood pulp than plastic)
Price range in todays market for good product $2.30 - $3.50 per foot
I couldn't find it online, but this months This Old House has a good article on composite decking comparisons.