the 900i is the compliant version of the 900 series the LVLP is simply the 900 the 900 is blue the 900i is gunmetal grey
its what i use and when i sold one of two i got off ebay BNIB for £50 each as no one bidded against me becouse basicly the name isnt well known, the guy i sold it too hung up his Sata 3000 RP and hasnt used it since for his clear jobs ,he now bases with it lol
made by Bersch and Fratscher Germany and voted worlds no 1 clearcoating gun by a European magazine ,have to say i agrea haveing used Sagola 3300 and 4400 models amongst many others inc 2000 and 3000 RP,s it even bettered my Walcom FX HA
now superceded by the Trifity model which will convert from LVLP to compliant simply by swopping out the aircap you no longer need to buy two separate guns if you dont wish to
downside the pots are flimsy and the seal on the lid breaks away so after a while they leak ,the lids are even worse than sata in that respect however i have found a solution and now use a spuriuos pot instead ,overall build quality is superior to Sata ,no plastic nobs to break and wear loose and a much nicer air micrometer
price i think is cheaper than Sata but to be honest Sata are not the guns i would choose and are IMO way over priced
anyway the Optima 900i is definatly the finest clearcoating gun i have owned and i have owned many guns