Wishing I had the option to buy this one. I may be looking for a round of financing to catch up on all the gear I need, if that happens soon enough - this is on the list.
It's a powerful instrument, we have one of these in our lab at work.
Assuming I've grabbed the relevant info from the ebay pictures it is probably about 11 years old. The price looks really low and I'm amazed it hasn't sold already (because of the options it has) but I can offer some experience wrt Tek RTSAs.
They aren't that nice/intuitive to use. The user interface is best described as odd and clunky and some common things are buried in sub menus. Also, our RSA6114 hasn't been reliable and when it goes away for repair Tek seem to keep it a long time.
Despite the high performance (in terms of real time bandwidth and RF performance) the RSA6114 isn't a popular choice at work. Most users prefer the UI of the smaller and older RSA3408A model although it only has 36MHz RTBW. The RSA6114 spends a lot of time unused or at Tek being repaired. I think the last time it was repaired it took several months before we saw it again.
The other thing to note is that Tek have a fairly aggressive support policy on stuff like this. If you buy it from new and keep it for several years beyond the initial warranty period the yearly support and cal costs get quite high. Several thousand dollars per year?
If you drop out of this system and hope for the best the MINIMUM cost of an 'on demand' repair for this instrument (from Tek) is about $15k. That's $15k minimum cost for any repair. We were quoted a similar sum to repair an old Tek RSA3408A. More than the used price on ebay and this is just the starting price for the repair.
It's a great piece of kit best aimed at a company who are looking/hoping to save on the (alternative) costs of renting the same instrument for several months. i.e. a costing gamble with a huge bonus if it stays reliable for a year or more. Like I said, I'm amazed it hasn't sold already at that price.