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I am certain the first 5 reviews are by friends or family of the owners of Displet. This one is a legit one, by someone who used it. I had to buy it just to see how it worked which cost me $100 "set up" fee, and $60 month first month. Then after it was "set up" I was then able to see it was NOT what anyone would want for many reasons. I sell Charleston SC real estate, and the properties it was showing were labeled NC just for starters. The popup widget caused problems in my site so I had to disable it. Within 4 days of realizing I didn't want it I notified them I didn't want it, and they wouldn't refund my money for being "unhappy with the product".
Their contract states if for any reason you are unhappy and want to discontinue service we will refund you your first month payment if you give notice within first 10 days which I did. Last I looked still haven't been refunded.

Here is more reasons why it isn't what you want:

1.) Uses an iframe which is not good for SEO, or user experience.
2.) You as the owner of the site has zero control over the functionality, design etc. because it's all on their server
3.) You have to give them backend access to your site basically in the form of an A record.

There is much better services out there, and the one I found is NOT only 100 times better, but also $20 month cheaper.

You have to host your IDX/RETS on "Displets" servers. Do a test and you see how slow the pages load, even with a fast internet connection. On mobile it does not load at all sometimes. Data from wrong regions show up in "your" area. No way to delete "powered by displet" advertisement. Can not use a standard Google sitemap plugin for your listings. You have no control over your data or content at all.
It is also not cheap.