I bought one of these.
Only for small jobs really but very handy!
Stanley Mini Trigger Glue Gun 0-GR15
https://www.amazon.co.uk/Stanley-Mini-Trigger-Glue-0-GR15/dp/B000RI1YUA/ref=sr_1_3?ie=UTF8&qid=1518131198&sr=8-3&keywords=hot+glue+stanley
I have used this Stanley over all other options we have purchased over the years.
And purchase these to back up one or two in use on the job, And I do big jobs.
The 30 cm long glue sticks keeps the feed going reducing the need to stop and reload.
The High temperature feature is nice when doing long (1.2m) runs of glue and can do this several times before needing to catch up, and reheat.
Cons:
The trigger spring will break after about two or three years of heavy use.
The High temperature setting can overheat the glue if left to sit and can cause third degree burns.
... if you are not running the glue gun for a few moments set it to low...
It is better to wait for it to heat up, than suffer any burns, or have a joint that won't cure quickly.
Note: If you get hot glue on your hand,
wipe the glue off your hand, do not wave it around wildly trying to cool off the glue.
In the photo below, all furniture pieces are foam core, and hot glue.