In our trust we have Arcomed 5000/7000 series. Hospira A. Carefusion all series.

Regarding Arcomed never had bad customer support. Volumed 7000 are little tricky to work on. They do get broken down but easy to repair not very expensive to maintain.

Hospira had some issues. Got HMRA alerts. They seem quite fancy.

Love carefusion never had any customer support problem. Easy to maintain/repair/use.

Couple of months back we had T34 to repplaced ours MS26s. They seem good though.