I looked at quite a few of the competitors roof windows and none compared to the quality of EOS Rooflights. In situ, they look fantastic. I wanted to construct my own insulated up stands and the sales team at EOS provided plenty of quick technical info to assist. I also need to delay my order and EOS kindly agreed to store a large roof window for a couple of weeks until I had space on the job site. If you are planning to construct your own insulated up stands, beware of the amount of time it will take you or your carpenter and factor this cost against buying the up stands from EOS (you will need an onsite table saw, unless you have a workshop and adequate space for a glue up). Make sure you have a plan on how you are going to get the roof window to its final location prior to purchase-one of mine was 2.8m long and weighed circa 250kg-I had a relatively easy route to the installation point , but I doubt this will always be the case.