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When I got my first robot, I felt that I wouldn't need to spend the money for a 360° glass. Well, it's just about impossible to keep a single retroreflector pointed constantly at the instrument. Turn away even for a few seconds, and lock is lost and time is wasted reorienting the target and waiting for the instrument to reacquire the target.
I have a couple of mini prisms similar to the Seco (6405-12), but prefer one like this: 
for stakeout. Fairly close tolerances can be met by using care in orienting the prism.
Any experience of the trackability of Seco 360 deg. prism (6401-00-YEL)? As it is a Seco product, I would think it is of good quality and cheaper than Leica 360 deg prism as well. The prism design as an array/assembly of 6 individual glasses provides a feeling that there would be dead spot(s) around the prism.
If I recall correctly you use Leica -17.5 mini prisms, when you use standard mini prisms robotically the error from pointing of the prism creeps up pretty quickly.
Are you working alone without a 360 prism? I thought you were the user that touted the higher precision lighter weight 360 Leica glass.
True precision aside I have found that working alone with tracking to a standard, moving prism to be an awkward proposition leading to second best results. That loss is what I was trying to speak to, more than say genuine centering error.
