Best Backflow Preventer Installation in Dallas TX

I used Steven's Irrigation to repair a broken PVC pipe on my irrigation system and then later I had him replace one of the drip lines with sprinkler heads.  Steven seems to be knowledgable and did a decent job on the first two jobs but was terrible at communicating the basics such as the time he would be coming or responding to text, phone calls or emails.  He would just show up whenever the first two times.  I texted him to fix a broken irrigation valve that was leaking quite a bit of water into the street and he texted he would come out on Friday, five days later.  I called Steven on Thursday night and left a voice message to confirm he was coming Friday morning and I followed up with a text. Steven never responded to either.  On Friday I waited all day and made several calls (which went unanswered) and several text (which also went unanswered).  Steven never showed up, never called me back, and never texted me back.   The following Monday I called another irrigation company who came out that same day.  I see there is another review in which Steven did the same thing (promising to come out to do the repair but then fails to come out or communicate he is not coming).  I would NOT recommend Steven's Irrigation.