Vasari colonizer cap (Jarrasul Evacuator) gives a 20% structure build rate increase. same bonus at each of the 3 levels for the skill, it just lasts longer at higher levels. 

i actually think its a better bonus than the TEC bonus. resource extractors cost almost nothing (250 default, only 150 for most TEC players because of their civic research tree) so the comparitive value of free extractors is pretty low, possibly as low as 300 credits. the only benefit from them is getting to harvesting resources that much faster, but its only a difference of about 60 seconds since extractors build pretty fast. you also don't get any bonus at all at level 1.

i think the Akkan is by far the weakest colony cap ship. weak gunnery, fragile compared to other cap ships, and not particularly useful special abilities (Ion Bolt is pretty good, the aura is sucky, and its got a weaker colonizing ability than the other 2 in my opinion). 

Jarrasul Evacuator and Progenitor Mothership are both great though. Good bonuses on the colonizing ability (the advent bonuses are particularly great) and VERY good special abilities. Jarrasul's Nano Dissasembler is an absolutely lethal direct damage ability. Mothership's Shield Restore is a core ability in advent fleets when combined with Iconus Guardians. 

While I originally thought it useless, Targetting uplink is usefull for making flak more accurate vs DC and increasing the range from what I understand.

this is a good point. the accuracy bonus is also very helpful while fighting in asteroid fields (-20% hit penalty) and against a Rapture Battlecruiser with Vertigo (gives -10/20/30% hit penalty depending on level).there's also a pretty noticeable enhancement for move+fire damage since ships seem to suffer both range and hit penalties while firing on the move. on the other hand the Akkan itself is very slow so its easy to outrun the aura in a chase situation. its not useless, i just think its not useful enough compared to other buff auras. the Halcyon's rate of fire increase or the Rapture's squadron damage increase auras both puth Targetting Uplink to shame in terms of overall effectiveness.