Yes, those.
The TT5 is a transceiver, meaning it can be either a transmitter or a receiver. The MiniTT1 is a transmitter only and can save you some money. You can get 3 TT5 tranceivers, or 2 TT5 and a MiniTT1 for your camera. Lots of people prefer to get all FlexTT5.
The "Plus II" was the workhorse of many photogs. They were reliable, but now many cheaper triggers have sprung up. Mostly pros who can't afford a misfire still buy the Plus II's. Like I said, they're simple triggers and don't send ETTL info.

