Mys advice would be that if you get on OK with Asics road shoes then stick with their trail shoes
I have Asics trail shoes (Gel enduro) which have some cushioning and support and feel much like a road shoe to me only have a bit more grip.
I only run off-road (bar the odd rural lane) and have the Asics for hard-pack trails and also 3 pairs of Inov-8 for everything from fell to wet mud when it gets really off-road! They are great on grip but have no really concept of support, cushioning etc. Tha'ts because it is not so much of factor I guess - who needs cushioning when you are running around in ankle deep mud? 