I have a herp4 no issues and did my research. I was looking at the vivarium ve2 but spent the xtra on the herp4, only because I can control more racks. The ve2 and herp2 were both priced about the same but the ve didn't offer a 4 probe setup. But one thing to keep in mind....this will be the single most important part of keeping healthy reptiles. Don't cheap out! I also have a helix. That works well. I just thing between the helix and ve2 get the ve2. I just got the herp4 so I didn't have to my more stats. Good Luck!