Yep - you can get a regular 2D variant of a Helix 9-10-12 or ONIX and slap a 360 on there...
I would have saved up some coin for one, but don't feel the 455KHz is capable of displaying sharp enough images for my liking.
I have mentioned before if they came out with the "Hi Def" version with longer crystals and 800 KHz capability, I'd bite.
I fish in a few feet of water out to 50-60 sometimes 70 FOW for fish and I don't feel it's as beneficial to my style(s) of fishing as the HDSI can image with 800 KHz.