I tried to use it for an hour or so and listed around 30 bugs/totally broken/illogical things.
Maybe you could post that list, if it ever existed. With the particular build number that you are talking about.
As mentioned before, if you want a stable release use the one marked stable. It's not really a difficult concept.
You could use a stable build if there was one which wasn't ancient and totally and utterly incompatible with the new version.
1) Gives off error about not finding project/schematic/layout file on a new project
2) Saving a new schematic saves it to some noname file, should ask for filename...
3) New schematic remembers active libraries, it shouldn't?
4) No "save as" option in schematic editor, SERIOUSLY??
5) Placing components to schematic is extremely laggy, bug or?
6) "Choose component" dialog text box loses focus when you type in a character...
7) No fullscreen cursor in schematic editor (anymore?)
Impossible to select components near eachother, if selection box just touches a component it will be include in the selection
9) Tools/buttons are not listed in menubar menus, WHY?
10) Hotkeys not visible without accessing hotkey list due to no actions listed in menubars
11) Pressing hotkey button for wire starts drawing wire immediately instead of just selecting tool "place wire"?
12) Capacitor symbols descriptions in french?
13) Schematic view is not properly redrawn after moving components
14) Why are connections not preserved when moving components in schematic?
15) Deleting a wire should delete it to the nearest connection, not all of it
16) No spreadsheet view to add pins to schematic symbol
17) Zoom too aggressive (Component library editor)
18) Cannot rotate pin with hotkey when moving (Component library editor)
19) Cannot move pin by just clicking (Component library editor)
20) No move vector when moving (Component library editor)
21) Library editor asks THREE (!!) times if you REALLY want to when saving, what??
22) No fullscreen cursor (Component library editor)
23) No save button except without text on toolbar?? (Component library editor)
24) After saving, library is not current and have to resave through dialog (apparently have to load library through schematic, eh) ^^
25) After saving library editor however remembers the last component even though it shouldnt??
26) No way to create new library through library editor!?
27) None of the programs remembers last opened file dialog, have to enter same directory each... and... every... time
Unfortunately I do not have a build number handy, have to check it later. It is probably close to 2015-03-15 BZR 5517 build which I have on this machine. So about two months old.
I hope you can figure out what I mean by most of them. They were mainly meant as a personal list for reporting (few are "feature requests"). There was just so many of them that I sort of lost hope and figured there's no point even in reporting. And I bet according to devs most of these are probably "working as intended" looking at the way similar reports are handled in launchpad (or then just no reply). The funny thing is that quite a few of them are issues that were not present a couple of years ago. For example the fullscreen cursor. I cannot fathom a single good reason why would you remove a harmless feature like that, that already existed previously?
I didn't even get to the layout part because the workflow was just totally broken. Setting the libraries was changed to some kind of mysterious spreadsheet where you had to type in something to include the libraries, but it was totally unclear what. Also it didn't seem to support the old type libraries, just the new ".pretty" (the fuck??) and I was unable to find any information on how to convert the two.
I used to be more excited about the KiCAD project (you can even go through my post history and see I've only tried to support and praise the project previously), just feels that without some major change and/or rework of the UI it is not really going to be usable for many people.