Buying my first robotic total station - Trimble S5 or Spectra Focus 35 or...?
My passive prism tech 1998 vintage Leica robot still serves me well.
I think that you will find that the S5 is a higher quality instrument than the Focus35, and Access is better software than Survey Pro. The extra money you spend will soon be forgotten.
I had a Focus 35 w/SurveyPro, both onboard and in the Ranger DC, for 3 years. Never had a problem with either, but I only worked in the woods and never in an urban setting with lots of other reflective surfaces. It wasn't as good as the S6 I used when working for a large company years earlier, but at roughly 1/3 the cost it was a no brainer.
I would be considering the support that is available aswell, are you buying online or through a dealer? What I've found over the years is that support is just as important as the purchase, at least while you're coming to grips with a new jigger. That said, an S5 would be my pick, if Trimble's passive tracking behaviour is the same as the Focus, then you will need an Active Track target without a doubt. I'm currently using an S6 with a passive target, and while accuracies are awesome, the minute I step out into a highly reflective environment it starts losing the plot, I've even had it tracking the reflective strips on my vest.
Also, to maintain high vertical accuracies, I would purchase an AT360 prism over the MT1000. You won't get the same range out of a AT360 but it will be more than sufficient for robotic work.
I have had a Focus 35 for almost 3 years and recently had to replace the data collector radio. Other than that I've been very happy with it. Prior to buying the Focus I used an S6 for many years. All that being said, I've been using a rental S7 for 2 weeks and it reminded me how much faster and smoother the Trimble units are. The S7 connected perfectly to a Ranger 3 with Survey Pro but vision doesnt work, as others have said.
At this point I would go for an S5 but the Focus is a great gun for the money.