The best replacement for rs1i is rs2i.


The best alternatives to rs1i are rated as following:
★★★★★  rs2i
★★★★★  ps500
★★★★  gs1000i
★★★★  ms-pro
★★★  rs1
★★  ps1000
★  sr325i

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No companions for rs1i have been suggested so far.
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Google Trends

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rs1i
rs2i
ps500