I would try it out. If the suspension is not too boingy, or, if it is, and you can lock it out, go for it! I commuted ks of miles on Fisher front susp mtn bike, suspension (very short travel) was nothing on my energy budget compared to luggage etc... (and it was also nothing toward my comfort budget, I have to say). But you can't judge if the susp is too boingy until you try it. Maybe you will want to try a fully rigid bike side by side so you have a control to judge the suspension against.