[asterisk-users] GSM Sip Gateway

[Frank]

Hi all,

Anyone ever used GoIP GSM SIP Gateways ?
If yes, what was your experience with those ?

I'm looking at this:
http://www.ebay.com/itm/HOT-GSM-VOIP-GoIP-Gateway-SIP-Trunk-to-Asterisk-iP-PBX-/280736774012?pt=US_VoIP_Business_Phones_IP_PBX&hash=item415d37377c

If anyone has any (good) experience with another brand, I'll take the 
names and models.

Thanks