Plug and Play or wire in?
I've just replaced my MR2 Link with a wire-in Monsoon myself, new loom is in the process of being built (when i can be bothered working on it)
Links can do all the things a Haltech or Adaptronic can too.
The wonderful thing about the Link is you can get the right ECU for the engine. So you don't have to go and buy a top-of-the-line ECU and then never use 80% of their functions
the 3S platform is a bit of a dinosaur these days, so they don't need much processing power to run a 3S-GTE extremely well.
Fortunately, I've managed to get my entire loom, ECU and pins replaced for roughly $1,500
All that's left is to finish the loom itself and I'll start driving again
race you once Tailem opens up