I think that's close enough, i listened to the sample, it's too much an English pronunciation, it's a more open sound than that. Therefore i made my own sound sample, with the Dutch words
ui ("onion"),
sluijter (your surname),
huis ("house") and
tuin ("garden"). Maybe this clears it all up.
http://www.angelfire.com/nd2/firstnames/sound/dutch/sluijter/Sluijter.mp3