The Persei and the Omicron are made for different purposes. The Persei is for heavy home use and the Omicron is for stealth operations on the go or moderate medicating needs.
I first had a Omi v1 which served me well for months. It gave decent hits, had zero charger problems and virtually no cart issues. READ THE F*CKING MANUAL !!!!!
There is a learning curve. Hit it once too hard and it will clog, GUARANTEED !!! I upgraded to the Omi v2 a month ago and use a lower 1.5 ohm cart. I can get as big a hit as a small dab.
Again, READ THE MANUAL or the Vaporpedia wiki page for Omicrons.
http://www.vaporpedia.com/wiki/Omicron
By the way... Delta9Vapes has the BEST customer service.