No. Prs is aimed to keep until you retired. Unless you don't mind being penalised.

RM500 is given once for lifetime, so it is not something too good to be true
i believe just a strategy to build the awareness of PRS and attract ppl to buy......

Personally, i would say PRS just something like EPF in voluntary basis and giving you additional tax deduction

mind sharing where did you get this info that "most" pick CIMB and not Affin hwang?
this is PRS thread...so I assume you are referring to PRS funds....

cannot sleep thus I compiled the data that I got...it shows Affin beats Cimb by a large margin....

For me is very easy. 
Income tax money is not yours at the end of the day.
PRS money is yours at the end of the day.

Just hentam max RM3k/year inside. Don't hentam more. No point hentam more when tax relief max only Rm3k. Also who cares cannot utilise fully. See the above. You rather pay tax or pay yourself? I know what I will choose. That's why my RM3k is always ready for PRS.

Tax relief until 2021. If don't extend, don't put in anymore lo. Simple. If extend,  just continue to put in.

I think that you're confused between tax relief and tax rebate.

Let's just use your example of paying RM 600 of tax in a year.

Tax rebate - very few possibilities. Most famous one is zakat. If u pay RM 300 in, then you need to pay only RM 300 in tax. In short, tax rebate subtracts from the total tax that you need to pay.

Tax relief reduces your taxable income. The taxable income is calculated by subtracting the tax relief from your total annual income. For example, if you earn RM 48k in gross annual income and you get RM 3k for PRS, your taxable income decreases to RM 45k. There are other tax reliefs to be added like EPF, SOCSO, etc.

Fyi, the taxable income is taxed from 0% to 28%. So, if you earn 1 million a year, your highest tax range is 28%. For 3k in PRS, you save RM 840.

If you earn 48k a year, 3k in PRS represent less than RM 300 of tax refund - I didn't do the exact calculations.

That's why there is pros and cons depending on your salary. Bear in mind that the money is yours but it's locked until retirement. You can partially withdraw but you will get tax penalty.

It depends on your confort zone as you might need that 3k in a few years to come??? Idk... You have to determine it yourself.