I've got two of the small SC-608 from banggood.com, and I think they are really good. Got them when they were £35 each.
I use them on 12V battery outdoors, and on a PSU indoors, very happy with how they work, they are compact and work great. colour screens are bright and good outdoors.
My first one had a problem with the screen backlight, but i contacted ISDT though their website and they sent me a guide to fix it, basically remove a resistor off the internal circuit board. I got that a while ago, and it really was first batch teething problem. Now its fixed, its not missed a beat. I've also upgraded firmware as the seem to have released a few over the 8 months. the Chinese company who make them seem very responsive, and i've had a few emails back and forward with them about the charger. they seem keen to get a good product out there.
Schumacher are now importing and distributing them, at higher prices than banggood of course.
I got mine here
https://www.banggood.com/search/isdt.html
and the other chargers int eh range certainly look great.
I've no hesitation recommending.
