From personal experience,( I have just bought one) and then from careful study of what's on offer at the moment, please be aware that many of the Odyssey SRT Tri-Ball Putters currently on offer are FAKE.

Be particularly careful when stock photos are used rather than pictures of the actual putter. Some of the more obvious signs are:  Too cheap !!!!  -  The three balls on these fakes are too far apart, the SRT rings are too egg shaped, rather than semi-circular, the face inserts have sharp corners rather than rounded etc etc (use the odysseygolf dot com web site to compare) 

Good luck and happy putting