Whats the perk in using the Akai S series

What is the perk of using samplers like the s5000 in conjunction with your MPC. I know a few cats that have them but I wasn't sure how they integrated them into their workflow.

S-series samplers offer a lot more sound and program editting. Keygroups allow you to play your sample chromatic on a keyboard/midicontroller, with envelopes (attack/decay/sustain/release) for amp, filter, pan and pitch. Also, layer different samples together, loop samples and edit samples.

Basically, you can make an instrument out of short samples (even single cycle waves).

Another reason people buy those samplers is the sound. Especially the S950 (or 900) and the S3000 (non-XL) have a nice oldskool sound because of the AD/DA converters and the bitrate.

You can pick up a S2000 for about €20,- these day. I suggest you try it, read the manual and the go buy some floppydisks.

not trying to b a dick just sorta reiterating rack samplers such as the akai s series are true samplers. The mpc design at its base is not a sampler it s a sample based drum machine/sequencer. the mpc 4000 incorporates a true sampler (akais z series) and the more modern ones equipped with jjos have features that push it more towards a sampler. Samplers at their base were designed to do the same thing as the modern vst s: imitate real instruments and synthesiser sounds. Building full patches of said instruments to be played by a keyboard with the full range of notes accessible by a keyboard. The mpc was not created to do this.
People incorporate rack samplers for many reasons really but in general its to have access to libraries of pianos , strings, winds etc.. or to create your own.