The AMS chip is better than no chip. I've had one for the past 5 years or so with no complaints.
Your only other option is a Garrett chip, Their website claims they make a chip for 023 ecu's (CA Model Digi 1 cars)
mine was only $150 when I got it 5 years ago. The CA Digi 1 chips are easier to install than the Digi 2 ones in that they're just plug and play and dont need to be soldered. If you're buying used I wouldnt pay more than $100.
I might actually have mine for sale in a month or so
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