While the ship upgrade system with the 8 slots is nice, as it is implemented there are actually only 2 builds for each ship, one for GB/WOF and one for HA. FCS: As is only reason to upgrade is to get HA bonuses - no functionality in online battles. Suggestion: increase sight/radar/sonar bonuses and maybe add a 5% chance for critical hit (+50% damage or so) bonus at each upgrade. Main Guns: for most CAs and BBs the lvl 3 guns are the only way to go. If the difference between levels was smaller there could be a reason to build a battleship with eg. gun lvl 1 or 2 in order to get some other upgrades. Sec Guns: as is only reason to upgrade is to get AAW enabled status. Suggestion get all levels CL/CA sec guns AAW enabled (DD/CL prime guns where applicable) and give them different bonuses each level (eg. lvl 1 small range/slow reload/high damage, lvl 2 med range/med reload/ low damage, lvl 3 med range/ slow reload/ high damage) so any setting will be an option with higher levels a little more appealing Armour: instead of belt/deck/bulge in separate upgrades have all of them in each, increasing by a percentage (eg. lvl1: 1000/600/250, lvl2: 1250/800/500, lvl3 1500/1000/1000) Torpedoes: not bad as is. Hedgehogs need a small boost to become relevant again - probably a bundle of 5 as stated is a good idea Speed: not bad as is Flightdeck: Irrelevant in any ship other than CVs and mogami44. Could be dropped from other ships Aircraft: is there any bonus for the fighter upgrade? if there is please make it apparent. if not a small one would be nice.