I've seen people quote these sets as different sizes somewhere about +/- 50mm. I have a fair selection and except for one Vader at 52mm, my collection sits consistently about 48-50mm eye heights for the humans. The figures are decent and if you can round them out with other similar sized figures, fairly reasonable. On their own the sets don't provide IMO enough variety except for very targeted scenarios. The vehicles are also quite nice if you have other appropriate scale uses for them.
If you come across some decent options, I'd be interested to see them as well. The Gundam sets above are quite intriguing.