Guitars and bass series
Dependent on the target market (i.e. Asia, US, Europe) and brand (ESP, LTD or Xtone), various models are organized in marketing series.
The ESP Original series has three other lines of guitars, the Edwards, Grassroots and Navigator series and are largely based on these models as well as some ESP Standard series Models. ESP Edwards Series produces mid-to-high range guitars, at a quality near the ESP Standard series, whilst ESP Grass Roots Series cater towards a more value-oriented segment of the market and are more akin to the 400 series of LTDs, however these can vary. The ESP Navigator Series on the other hand is a line which produces mainly replicas of Gibson and Fender guitars and basses, to a very high standard.
ESP USA features the ESP Standard line (which was replaced in 2014 by E-II), as well as the lower end LTD and Xtone series. ESP USA's standard series generally caters more towards to metal players, with characteristics such as active pickups.
Another line of guitars, called LTD Elite, was introduced in 2013 for overseas markets, as the ESP Standard line was slowly being phased out. LTD Elite guitars are made in Japan, and initially offered alongside the ESP standard replacement brand E-II in the export market in 2013 while a limited range of ESP Standards were sold in the US to be phased out for E-II in 2014. The ESP Standard line had been completely discontinued by this time. E-II guitars initially resembled several Edwards designs, however in 2015 many new models and finishes not available to Edwards were released. In 2016, E-II receives many new and first-time models, including Eclipse guitars with a sculpted neck joint similar to Gibson's Axcess heel to improve playability. According to ESP, E-II is the direct successor to ESP Standard with no difference between the two except the name.
ESP Custom series
ESP also builds custom guitars and basses, made to the specifications of the customer and the quality of such custom guitars exceed that of the Original series. These can be ordered from ESP USA but they are made in Japan. Generally speaking custom guitars cost as much, or even more than Navigators depending on the choices of the consumer and are considered to cater for the top-end of the market. There is flexibility with the orders, as the guitars produced, do not have to be based on existing lines of guitars and basses.
ESP Artist series
The ESP Artist, or Signature series guitars are mass-produced versions of artist's personal guitars and basses. The quality of the ESP Artist/Signature models lie between Navigator/Custom Shop and the ESP Original series.
The Edwards, Grassroots and LTD artist models are in the higher-end segments of the respective lines of guitars and basses.