SmartVent vs HRV

Haven't been on here in ages, so apologies for jumping right in with a question. I've looked at previous threads on the subject but some of them are a bit dated so I thought I'd revisit the issue.

We're in the process of getting quotes for HRV/SmartVent/Moisture Master/DVS. Does anyone have any experience of any these systems and have any valuable advice regarding them?

We're pretty much decided on the fact that we're getting one - just mulling over which one may be best :)

We have a HRV and are happy with it. Keeps house dry - so much so that cracks have developed in some of our furniture! It is not a heating system but it does help to keep house at a regulated temperature and humidity throughout the year - particularly noticeable in spring and autumn.