Buying anything you like within your own means is by all definition good to yourself BUT given the nature of real properties that are permanent in nature and it does not come cheap, it's always better to take into consideration the prospect of it because to be honest unless you intend to stay at that one place for the rest of your life or you foresee yourself not needing to flip your current property to purchase another one them.

To me, studio apartments are designed for 2 groups of people:-
1) individuals who does not intend to start a family for at least twenty (20) years from their date of purchase; OR
2) individuals who intend to generate profit from it (be it, subsale or rent).

My general rule is if you do not find yourself falling into either one of the above categories then avoid.

This is the ideal situation for all but super risky.

Moving on to your next property still means that you are financially restricted to service the loan of your existing property so the rent generated from this property cannot be used to assist  in your purchase of the next therefore unless you have some financial freedom, maintaining 2 real properties at the same time is quite a bad idea.

Whatever it is, just make sure that your account balances with surplus because you never know what will hit you.

Good for a start to ur journey in life as you can have a whole unit to urself without having to share bathroom/common area with housemate if ur going for a bigger unit. Start small as nowadays as studios in good area can be found at less than RM300K...

what areas are you looking at?
location is important..

PJ manyak besar ..which area specifically? 

at the end of the day its up to personal choices - I have seen an aunty buying a studio before as she said no inclination to clean so want a small place
with security..young people may also choose studios as they just need a place to sleep..they eat out all the time and have an active social life so cant
be bothered with maintaining a bigger place.

650+ is a good size..

Price wise hard to comment as it depends on several factors.

if you have a gf or new wife then how?

studio one shot see all very small only

one eye look see all

depends on the layout, for 650plus sf, it maybe can put a partition and make a 'extra' room. then become 2 rooms apartment

Quite frankly, RM650+ per sqft is considered rather expensive already. It better comes with state of the art facilities and has super good maintenance and looks absolutely stunning on the exterior and the common area otherwise, you are over paying (taking into consideration the current real property market).

By the way, have you check the monthly maintenance charges and other commitment fees you need to pay?

I realized most people failed to take this into account when making their purchase. This affects you in the long run and can drag you down to hell with it.

Imagine if the charges are RM0.30 per sqft, a unit with about 2k sqft will already costs you RM600+ already.