Just successfully flashed my Netgear WNDR3800 with 1.5.10, worked a treat staright away.
I had to' remap' the router IP as I have a D-Link modem attached for internet connection, but once that was done and a computer restart, all worked perfectly.
I recently flashed Gargoyle 1.5.10 on the following routers:
TP-Link TL-WR1043ND
and
TP-Link TL-WR703N
I don't remember having any specific problems doing the upgrades.
There is a lack of documentation on upgrading the 703, but firmware specifically for this device is on the download page and it worked great. Though I did my upgrade from OpenWRT as I was already trying that.
There are plenty of instructions on how to maneuver through the Chinese interface to get to the upgrade page, just google it. I imagine you can upgrade straight to Gargoyle and skip the OpenWRT step.
I did have some trouble trying to load additional packages from the command line on the 703, but the basic firmware appears to work great.
The Client/AP mode works great, it lets me attach my wifi AP to another wifi AP as a client. That is exactly what I was needing. Though if you change APs be sure to reset the 703 config to just a standard AP as Gargoyle won't come up if it can't access the AP it is configured as a client. If in doubt you can use the reset method and configure by IP address.
Successfully flashed my TP-Link WR941ND v3.5 with Gargoyle 1.5.10. Works great! Uptime is more than a week already (latest stock firmware hangs it in about 30-40 minutes under torrents).