Welcome to the forum.
Members here are from all around the world, and there are different rules for importing lasers depending on where you are located. It would therefor be beneficial if you also fill in where you live in your profile.
I`m not familiar with the exact model you are referring to, but Goldenstar laser have a good reputation among most members here at PL. Mimi is helpfull in any way. I have a couple of projectors from Goldenstar, and have to say that it is value for money. Worked more or less flawless the time i have been using them.
The D-RGB-1000-A is the low end from Goldenstar, and with 20K galvos, uncorrected modules with different beam size and divergence, you will quite soon want to upgrade. The platform, (Casing) is very good, and suitable for upgrades as you have the money to do so. Asis the D-RGB-1000-A are only suitable for beamshows.
Keep in mind that you also need software and a DAC to be able to control the projector. Those two items will probably cost more than the projector you are looking at. To do a beamshow, you will also need a device producing haze or smoke.
And... read about laser safety before anything else.
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Just got to love lasers!