Drawbacks with CSO vs ISO?

I just downloaded the CiSO Converter v1.00 GUI v0.3 For PSP by Andrei_

I tried to compress an iso of GTA Liberty City Stories, compression level 9.
The original ISO was 1.2gb and the CSO came out 596mb. The a huge save in card space.

I'm just curious. Are there any drawbacks or problems with the .CSO compression? Will the game loose out on being converted to .cso?

Happy for answers. I just realised this might mean I can bring more games on my vacation.

First.ISO talking is not allowed in this forum, once it´s agaist the rules of PSP section.

Second.CSO save espace, but requires more CPU power once the data read from UMD must be decompressed.. games wich reads much data from UMD in game will be laggy and slower. GTA and Star Wars:Deadly Aliance are good examples of this effect.Other wich loads all the data before a scene like YS will not be affected.

The draw back is... NEITHER OF THEM CAN BE DISCUSSED HERE! YUCK YUCK YUCK!