LISY does not only replace the original MPU by 100%, it also provides you additional Features such as a web based test (LISY_control), optional Soundboard, Freeplay Option and no need to use batteries any more. For a full list of Features have a look into the user guide
I sell a 'LISY Base Set' at cost price for 30 Euro, shipping in Germany included. The 'Base Set' consists of the 'bare' pcb plus 3 programmed PICs. Shipping Costs for Europe, US, .. vary. Payment can be done via PayPal.
Just send me an E-Mail (contact) and we can discuss details
No, you need to solder yourself or find someone who can do it for you. However soldering a LISY PCB is not difficult, just give it a try. Even for unexperienced People it can be done in less than three hours.
Just send me an E-Mail (contact) or have a look at german flipperforum Flippermarkt there is a big community with experience with LISY boards where you place a question and/or contact me there (nickname: bontango)