this shield is ok and it can be used with Arduino like every other esp module. and it can be powered with 5 V and has level shifters. I have a smaller module with esp 12 and level shifters and had no problem with AT firmware and WiFiEsp library and it worked with WiFiLink too.
one thing could be better - if the level shifted esp RX would be accessible not only at bottom side at Arduino TX pin position. it would make possible to connect it for debugging with softwareserial to some Arduino pin pair when attached to Uno.