Iphone 4 Portable charger..6$ Is this a good deal?

[tr1age]

I found this on amazon...

Is this a good deal? It seems like it.

http://www.amazon.com/gp/product/B0035R2QS4/ref=pd_lpo_k2_dp_sr_1?pf_rd_p=486539851&pf_rd_s=lpo-top-stripe-1&pf_rd_t=201&pf_rd_i=B004D0TCPC&pf_rd_m=ATVPDKIKX0DER&pf_rd_r=1C7RA6BDVQP5TCNV6BG4

Also does anyone know of any cordless charging options for the desk that do not require a special case?

Thanks!