The latest version that comes with NetRadiant (2.5.17n) seems to work fine with ET.
The first thing you might notice about it on first use, is the speed…
2.5.17
-meta
2.5.17
threads: 4
Q3Map - v1.0r © 1999 Id Software Inc.
Q3Map (ydnar) - v2.5.17
GtkRadiant - v1.5.0 Dec 1 2009 09:50:31
…
Wrote 10.4 MB (10923368 bytes)
63 seconds elapsed
-VIS
2.5.17
Q3Map - v1.0r © 1999 Id Software Inc.
Q3Map (ydnar) - v2.5.17
GtkRadiant - v1.5.0 Dec 1 2009 09:50:31
…
Wrote 12.2 MB (12751216 bytes)
64 seconds elapsed
-LIGHT
2.5.17
Q3Map - v1.0r © 1999 Id Software Inc.
Q3Map (ydnar) - v2.5.17
GtkRadiant - v1.5.0 Dec 1 2009 09:50:31
…
Wrote 16.0 MB (16808832 bytes)
371 seconds elapsed
Total = 498 seconds
2.5.17n
-meta
2.5.17n-svn402
threads: 4
Q3Map - v1.0r © 1999 Id Software Inc.
Q3Map (ydnar) - v2.5.17n-svn402
NetRadiant - v1.5.0n-svn402 Dec 1 2009 09:25:44
…
Wrote 10.4 MB (10882632 bytes)
30 seconds elapsed
-VIS
2.5.17n-svn402
Q3Map - v1.0r © 1999 Id Software Inc.
Q3Map (ydnar) - v2.5.17n-svn402
NetRadiant - v1.5.0n-svn402 Dec 1 2009 09:25:44
…
Wrote 12.1 MB (12704264 bytes)
38 seconds elapsed
-LIGHT
2.5.17n-svn402
Q3Map - v1.0r © 1999 Id Software Inc.
Q3Map (ydnar) - v2.5.17n-svn402
NetRadiant - v1.5.0n-svn402 Dec 1 2009 09:25:44
…
Wrote 15.9 MB (16712740 bytes)
229 seconds elapsed
Total = 297 seconds