I don’t have one but would definitely like one. Couple of reasons: they’re ideal for a day like today when it’s pissing down or when there’s ice, and there’s nowhere flat round here (and no track nearby) which isn’t ideal for targeted intervals. I’ve got a couple of mates that are keen runners and have one, and they definitely use them. I’ve also used them (in gyms) a fair amount in the past, and despite the “dreadmill” nickname I know I’m quite happy to get in a quick run on them.
So watching the thread with interest.