I have used every company out there. Vulcan7, Mojo, RedX, Arch,Landvoice and more. THey each have pro's and con's. I would say that you get what you pay for, I can't say that enough. If you are new to prospecting Expired's and Fsbo's, start with something less expensive to see if it something you can even do. It is not for everyone. Most people start it and stop it with 90 days.
Here are my reviews of each company. Again, I am not bias to any one company. I have used them all and know them all in debth.
Vulcan7 - Best customer service I have ever had. Best phone numbers I have ever had. Dialer is good but needs to be faster. They have told me they are working on a new platform that will be rolled out this year.
RedX- They have good data, and are a great company as well. They also have really good product and customer service. They are coming out with a dialer. I have tested it and it is ok, they still have much work to do on it.
Landvoice - NOT GOOD - they use Sales dialers which is fine but I do not care for sales dialers. They no longer push to phone burner or to mojo. They have tried to copy Vulcan7 data, but they are not giving full disclosure on how they do it. They provide crappy data to 70-90% of the data. the remaining 10-30% they fill in the gaps with the great Vulcan7 data. When you add a dialer and partial data you are almost at Vulcan7 pricing. They also will go days without data and have issues pushing to 3 party dialers.
Mojo - They have data now that they cell with their dialer. I have been testing it for 20 days so far. As of right now, it is ok. They are a dialer first data second.
Arch - Of this whole group this is the company I have used least. Expired's for the short time I used them was ok, dialer is ok.