Yes I have them and they are great. When I first started
vaping I also used a Sidesho, I felt it was very expensive and I blew two atty's in a month (one my fault) and the manual buttons caved into the
batteries all the time, so I went on the hunt for a less expensive PV and spare parts I could get from multiple vendors. That's when I found the popular 510. Then TV started selling 510 stuff cheap so I ordered some extra spare parts (atty's and Batt's) and I love them, they work like a charm for me.
With that said I am thankful for my sidesho that I just sold in the classifieds, it was the gateway to me quiting the analogs whoo hoo!!! But all the same a learning curve as to what works for me. ymmv