Come to think abt it, you look at the specs of the bubble king vs other skimmers,. Price issue aside, in terms of performance
This is from RE website.
Bubble-King 300 intern
base plate : 32 x 50 cm
for aquarium from 1200 – 3000 l/h
2.000 L/H air suction - 6000 l/h water
total height: 68 cm.
pump energy 58 Watt/h
Plus a red dragon 6000 l/h (65W) as feed pump, total consumption is 123W.
The specs roughly equal to a AP703
The European AP702 is fitted with 3 Eheim pumps each drawing in 700lts of air per hour giving a total of 2,100lts/hour.
For Aquariums up to:
Heavy Stocking 2300 Ltrs (444 gals)
Normal Stocking 3500 Ltrs (667 gals)
Power consumption for the AP703 (3x1260 needlewheel) = 3x65 = 195W
1262 feed pump at 80W
Total is 275W
Both BK 300 and AP703 has similar main chamber and very similar specs but you see the deltec draws more than double the power
Pricing wise also pretty similar (deltec cost a bit more) so I think the choice is obvious... less inital cost and less running cost.