This is only my opinion based on my upgrading experience and some looking around at other peoples comments on Mac lists and Youtube. You have a particular and good reason to upgrade and your machine can also have its RAM increased to 8Gb if my earlier post search is correct. Personally I like the Yosemite upgrade though there are definitely some who don't, however it is not significantly different to Mavericks so for most it may not be a necessity unless, like yourself, you have a particular reason. I don't know anything about Braille displays but assume it would integrate like a keyboard and not require a lot of internal processing as it will do this itself as an external bit of hardware. I have a usb midi keyboard controller that is not causing any problems. I would upgrade but others may have more to offer on this matter. TF On 28/10/2014, at 10:18 am, Lena Contreras <contreras_lena@xxxxxx> wrote: Hi I have a question for you. I have a 2010 MacBook Pro with 4 GB of RAM and a duel core processor. If it were your machine, would you upgrade to Yosemite? My problem is that I have preordered a Vario Ultra from Baum and it will only work with Yosemite. I’ll have to cancel the order and look into another braille display if upgrading my Mac isn’t advised. Thanks. Lena> > Click on the link below to go to our homepage. > http://www.icanworkthisthing.com > > Manage your subscription by using the web interface on the link below. > //www.freelists.org/list/macvoiceover > > Users can subscribe to this list by sending email to > macvoiceover-request@xxxxxxxxxxxxx > with 'subscribe' in the Subject field OR by logging into the Web > interface at //www.freelists.org/list/macvoiceover > > > Click on the link below to go to our homepage. > http://www.icanworkthisthing.com > > Manage your subscription by using the web interface on the link below. > //www.freelists.org/list/macvoiceover > > Users can subscribe to this list by sending email to > macvoiceover-request@xxxxxxxxxxxxx > with 'subscribe' in the Subject field OR by logging into the Web > interface at //www.freelists.org/list/macvoiceover >