Yes, I've tried Pigeon (hand/electric), ... and best one is Medela (Professional for home use and small electric for office use)... although it's quite expensive... it worth to use arr...
yes, you need to buy the accessories (the suction tube, the breastshield... but if you think about... (1) the advantages of giving mama milk to twins... (2) the 無價寶of抗體...(3) even you give milk powder, the price of no. 1 milk powder still not cheap... I suggest you use Medela lor...(even for the period you are at home...)
I've used Symphony professional breastpumps... rental deposit $3000 (refundable)... rental cost...(you can see the selling + rental price list as attached) and brought a small scale Medela breastpump for use in the office.