I don't own an SE but do have an Explorer II and an XTerra 70 so here are my two cents...
Personally, I'd recommend something like an XTerra or possibly a used Explorer XS/II for a first time detector user.
I love both of the detectors but the weight, balance, performance, and ease of use make the XTerra an excellent detector for someone who hasn't done much detecting (yet). The Explorer, on the other hand, does create more detractors due to its weight distribution and perceived difficulty of the machine. Any model Explorer is a great machine but it really isn't "turn on and go" type of machine for a beginner since it may overwhelm you with the amount of information and options it gives you.
That is why I love the XTerra 70 since I can turn it on and swing all day without bothering too much with the settings but when I need them, the options are there to make it more specialised.
That said, I also love the Explorer for the options and information that it gives me but it has taken many hours to get to that point.
If you can afford it and have patience to learn a powerful machine, go for the SE but if you aren't so sure yet how you'd do detecting, go for an XTerra or used Explorer II/XS. You can always graduate up to the SE in the future.
Also, it depends on the type of detecting that you want to do...an Explorer on a playground is a bit of overkill esp if you get frustrated digging up trash and pennies while learning the machine. The XTerra may be good on a salty beach, the Explorer is much better due to it being multi-freq.
btw, in the Explorer classroom, there is a recent thread that illustrates the frustration some Explorer users have had with their machines.
my two pennies...Keith