Yes, it is a useful cleaner, if you know how to use it.

I find it most useful to clean:

Cleaner>Windows tab:
Internet Explorer
- Temporary Internet Files
- Cookies
- Delete Index.dat files
System
- Empty Recycle Bin
- Temporary Files
- Clipboard
- Chkdsk File Fragments

I would strongly suggest you avoid using its Registry cleaning

I use CCleaner about once a month, including the registry cleaner. Never encountered a problem afterward.

Roger1955

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XPS 410 Windows Vista Home Premium
Intel Core 2 Duo E6600 Conroe @ 2.4 ghz
19 in FP Display/ IEEE 1394 PCI Express Firewire
3 GB DDR2 / Evga Geforce 7600GT/ 13 and 1 Media Card Reader
2x250 GB WD Sata II HDD'S (Raid 1 Array)
Sony CRX 3105S 48xCombo CD-RW/DVD Sata
TSST Corp TS-H553A 16xDVD+-RW/DL Sata
McAfee Security Suite, Spywareblaster, Windows Defender, SuperAnti-Spyware

Moreover, If everyone could done backup + CClean there won't be any recovery companies (cause of needness)

One more vote for dependable/safe/reliable.  Read through all the info/help screens for added info and best results.