I've always eyed the 4952... being as my penchant is HP and much of my test equipment is same-vintage HP gear (I'll give a vote for the 1631D logic analyzer, combo LA and digital scope - the scope is sorta poor, but handy - the LA is great for what I work on).
However, I spent a significant portion of my career in front of a serial analyzer so I'm pretty familiar with them. As much as I really WANT the 4952 to be "it", it isn't - for me. Mainly because I have found that having a unfolding or removable (or permanently in the usual spot) keyboard takes up far too much bench space - or is unusable when standing the unit upright (very often it was convenient to set the LA on the floor and on the models I use - the keyboard and screen face straight up). The ones I use these days are a Spectron D101 or D101X (I have them both). See http://ebay.com/itm/262261970901 The one I used for work projects - don't own - and may buy soon... is a Spectron D2000 which for some reason is labeled in this auction as a "Telenex AR Datascope 2000". See http://ebay.com/itm/301859511695 Since either of these have a front panel that is "on the front" and doesn't stick out at all... they seem to work better real-estate-wise sitting on the bench facing towards me, or sitting on the ground on the end - screen/keyboard facing up - so they are more accessible when working on a system. Just my 2 millidollars worth... J
