Mostly from wot I've heard swapping chips r just bad, especially no solder. Since I've had my ps2, I started off wit a v5 no solder r mod, then went 4 the neo 2.2 to play all of my games not just half of them, but then I heard that it damages the laser like f**k so I got the new neo4r which compared to the messiah I think is a good choice plus its £20 cheaper.
Goto
http://www.ps2modchips.com and u will find a good comparison chart of all the chips available.