If you ask me, i would say IS mechs are not their money worth.
The following example shows why: During leveling the kdk-2 up i tried difference build. This build is maybe not the best, but it gives me less facetime and as a result hihger survibility (lot torsotwisting). So after i got good matches in it, i tried the same build on a IS-Assault: I know the banshee ist 5 tons lighter, but it doesnt matter. you will get the same results on a atlas or king crab. Here are the builds:


Now if we compare, beside the kdk can carry an Ultra ac-20:
kdk/bnc
firepower: 40 (60) / 40
speed: 64.8 / 62.3 (BNC with speed skill!)
heat: 1.53 / 1.32
number of
dbl heatsinks 14 / 7
Now if we compare the quirks:
acceleration rate: 15 / 0
decceleration rate: 15 / 0
turn rate: 10 / 0
Torso turn rate (yaw): 25 / 35
Structures:
LT: 5
Rt: 5
LA: 10
RA: 10
CT: 15
LL: 10
RL: 10
(no structure quirks for the Banshee and aswell no acc/decc quirks)
Weaponsquirks: (only BNC got)
laser duration: -10
balistic cooldonw: +10
mediumlaser duration: +5
ppc velocity: +20
Energy range: +5
mediumlaser range: +5
I mean honestly those weapons quirks are for nothing, when you see how hot the Banshee compare to the kdk is. The BNC suffers from the low engine cap, and has to use a STD. It doenst get acc/decc quirks.... This is just one example, but the same thing is with boating balistics. The Kodiaks just obsolete my Maulers in every way.
So i ask you or PGI, why schould i buy any more IS-mechs?
You pay the same Money (example: Cyclops/Kodiak-Packs) but you will get on the IS-Side a junk chassis with starved Hardpoints, then it comes with SHS, STD...you have to invest millions of c-bills to make them even a slighty enjoyable. On the opposite you will get 3 xl 400, DHS, endo... everything out of the box.
So i ask you or PGI again, why schould i buy any more IS-mechs (with the current tech)? I really dont know...