the 1.5 firmware psp can play iso games from the memory stick

they tend to go for 175+ on ebay, ive sold 2 recently with 2gb cards for 210 each + postage

previously you could only downgrade firmware version 1.51 1.52 (upgrade to 2.00 first) 2.00 to the 1.5 using the mph downgrader, which is simple enough

but they have recently brought out the downgrader for the 2.5 and 2.6 versions (most are 1 of these) but its slightly more ticky to do, and i havnt dared do one yet . where as ive done 4 or 5 downgrades from 2.0 to 1.5

imo yes they are worth it for what you need, commuting. where as i dont commute, and i dont really play it much anymore so im swapping it for a 360