a illusion/kin's questions on inertial reduction n' siphon speed.

You take Siphon Speed and Hasten. PA will thank you for it. Siphon Speed gets 1-2 acc and 3 recharge. Anything less has me shaking my head.

I assume you are talking about an Illusion/Kinetics controller. Siphon Speed is one of the "must have" powers. It does not replace Hasten. SS gives you a stackable recharge boost (I think it is 20% per application). I generally slot SS with 2 Acc, 3 Rech, or 1 Acc, 2 Rech, and Acc/Slow and EndRdx/Rech/Slow from Tempered Readiness. Of course, it only works when you have a foe to siphon off of.

In Kinetics, the "must haves" for an Ill/Kin are Transfusion, Siphon Speed, Transference and Fulcrum Shift. I would include Speed Boost, but some folks seem to find it skippable. On the Illusion side, Blind, Spectral Wounds, Phantom Army, Spectral Terror, and Phantasm are "must have" powers that you should take as soon as available. I would include Deceive in there, too.

Hasten gives you a 70% recharge boost when it is up. Because the key power in Illusion is Phantom Army, boosting your Recharge to get PA recharged as fast as possible is one of the ways to make your character better. This is why both Hasten and Siphon Speed are key powers for an Ill/Kin.

Siphon Speed can be used, together with the temp powers, as a travel power. It has problems, like if you are in a high level zone, siphoning off of a foe can get you killed. Try Deceiving the foe first, as that will avoid aggroing that foe and others around him. You can use Invisibility for when the foes are such high level that you can't hit them. However, with my Ill/Kin, I took a travel power, as I find waiting until level 28 for Inertial Reduction to be too long. You may want to consider taking a travel power at first, then later using a respec to change out. Consider using Hasten/Superspeed since you should take Hasten anyway. (I use IR on one of my two Kin defenders -- it is a little annoying to have to re-cast it constantly.)

Even though my guide is for Ill/Rad, I suggest you take a look at the Illusion side of the guide, linked in my sig.

As the others have said Siphon Speed is an absolute must for an Ill/Kin; as well as giving you an early travel power combined with Hasten it will allow you to get perma PA on a relativily small budget.

When you get to the Epics I'd recommend Stone, for an Ill/Kin it is far and away the most effective.
Fissure gives you an effective way of setting up containment and increasing damage as well as additional control in the stuns and knockdown.
Seismic smash is a mag 4 hold that does massive damage - add in FS and Siphon power :-)
Rock Armour gives you another place for a LotG +recharge.

I would advise fitting Combat Jumping into the build as well, CJ prevents you being immobolized. As a Kin you need to be able to move freely for the buffs and heals.

An Ill/Kin?Stone is the ultimate Scrapptroller - play aggressilvely to get the most out of it.