>>>can i ...should I GET IT?
No!!! There are some... very few... who have owned a Parsun outboard on here and defended them as OK. But the general view is they are very poor besides any of the "proper" makers such as Mercury/Mariner, Tohatsu, Yamaha, Suzuki etc. They are Chinese clones of other makers models... for example their 15hp 2-stroke is a clone of my 2003 Yamaha 15hp. I'd rather my 16yr old Yamaha than a new Parsun.
Re the use of 2-strokes they were legally sold until 2006/7 but are still available new now if you have headed paper to say you have a business that would require an outboard. There is no restriction on the use of an older legally purchased 2-stroke.
You mention at the end p/exing for a Parson 4-stroke. Apart from the usual Parsun warnings I'd add that they are gut bustingly heavy at 52kg.
Probably the only person who will 100% advise a Parsun is someone selling one!
For the use you mentioned in your first post a 15hp will be quite sufficient. If you were to buy a pre-2007 2-stroke they are a far more manageable 35/36kg. If you want a newer or brand new 4-stroke OB then there is a slight dilemma in that the 15hp and 20hp models weigh the same at around 44/46kg for the latest Efi designs so apart from the cost issue there is no other reason not to get the larger hp.