It seems every week or so there is a Squier vs Fender thread. So having owned all three (P-Basses), I wanted to state my opinion on the whole Squier vs. MIM vs. MIA debate. So here is my opinion on each bass:
Squier P Bass (Classic Vibe): These are good basses. They have a cheaper feel than the MIM and MIA basses. They all are pretty consistent though, I have not played a bad one yet. The hardware (tuners, pickups, and pots) while not bad, are not as good as the MIM or MIA. The hardware may need to be replaced.
MIM: They have a slightly better feel than the Squier basses, but are more inconsistent with the build quality. I have played good and bad MIM basses. The hardware is definitely a step up from the squier basses. A stock MIM sounds better than a Sqiuer P bass.
MIA: These basses are a step up from the MIM P basses. They feel and sound better than both MIM and Squier P basses. Not to say, you cannot get the same sound out of the Squier or the MIM, but to me they sound and feel better. The hardware is top notch.
Squier P Bass (Classic Vibe): These are good basses. They have a cheaper feel than the MIM and MIA basses. They all are pretty consistent though, I have not played a bad one yet. The hardware (tuners, pickups, and pots) while not bad, are not as good as the MIM or MIA. The hardware may need to be replaced.
MIM: They have a slightly better feel than the Squier basses, but are more inconsistent with the build quality. I have played good and bad MIM basses. The hardware is definitely a step up from the squier basses. A stock MIM sounds better than a Sqiuer P bass.
MIA: These basses are a step up from the MIM P basses. They feel and sound better than both MIM and Squier P basses. Not to say, you cannot get the same sound out of the Squier or the MIM, but to me they sound and feel better. The hardware is top notch.