I've got 12 hours on that release and the 5GHZ is stable. Speeds are quite variable in the same spot, but I haven't dropped yet
Apparently there is an even newer still release out. I don't know if I'll try that one or not
Here is the changelog for the past two versions, r27086 & r27096. You can check out the thread for yourselves over at the DD-WRT support forum if you want to research past Betas.
Changelog & link:
DD-WRT FIRMWARE CHANGELOG
=> 27096 ----- 2015/05/28 ------------------------------------------------------------------------------
[086-087,096] Fix: QoS for bridged interface
http://svn.dd-wrt.com/ticket/4093
[089-094] Add: Dark GUI style
http://svn.dd-wrt.com/ticket/3742
[091] Fix: Frameset borders
http://svn.dd-wrt.com/ticket/3800
[093] Fix: L2TP
http://svn.dd-wrt.com/ticket/4043
=> 27086 ----- 2015/05/27 ------------------------------------------------------------------------------
[966-967,031-032] Upd: Kernel 3.18.14, 4.1-rc5
[988-009,014-035] Upd: nDPI protocols
http://svn.dd-wrt.com/ticket/4080 & 3557
[044,047-060,062,081] Upd: ath10k
http://svn.dd-wrt.com/ticket/4092 & 4113
[040-041,063,070,073] Upd: Info: HT40 intollerance, Powersave mode, GF Protection
[970-980,036,082,084]*Fix: QoS for bridged interface
http://svn.dd-wrt.com/ticket/4093
[030,039,068,071-072] Fix: HT40 intolerance and Bluetooth coexistence
http://svn.dd-wrt.com/ticket/4078 & 4111
[985] Fix: HT/VHT override configs during association
http://svn.dd-wrt.com/ticket/4078
[969] Fix: DIR-868L misdetection
http://svn.dd-wrt.com/ticket/4100
[981] Fix: FreeRADIUS
http://svn.dd-wrt.com/ticket/4099
[061] Fix: No DHCP with DNSMasq
http://svn.dd-wrt.com/ticket/4059
[067] Fix: Disable eth0 monitoring if WAN is Off
http://svn.dd-wrt.com/ticket/4067
[965] Fix: UTF-8 encoding for Bandwidth graphs
http://svn.dd-wrt.com/ticket/4027
[085] Fix: [Ralink] Bogus wl0 name on Bandwidth page
http://svn.dd-wrt.com/ticket/4112
[956-960] Fix: JFFS2 compression
[983-984] Fix: EU/66 regulatory domain
http://svn.dd-wrt.com/ticket/4051
[011-013] Fix: Random gibberish text in WebGUI
http://svn.dd-wrt.com/ticket/4044
[046,066]*Fix: PPTP
http://svn.dd-wrt.com/ticket/4088 & 3978 & 3280
Tim,
Sorry if all the links drive you crazy.