I have been for a few years now.
Started off with an older IBM laptop and a Canon printer.
I use Quicken for my accounting program, invoicing, data base, etc;
I also use Quicken Customer Manager as my diary, this works very well for repeat customers just as it does for day to day appointments.
Just recently got an Apple MacBook Pro which I'm having some reservations about.
Because of the Apple hassles, I still keep my old IBM up to date with all info

Problems with Apple:
Quicken now has a program for the Mac in Australia, (at last, the Yanks have had it for some time).
BUT !!! It only works on the "Cloud" version.
IF YOU CAN'T ACCESS THE INTERNET, YOU CAN'T OPEN QUICKEN TO WRITE AN INVOICE.!!!!
As I live in the sticks with many valleys and hills, reception can be quite poor or even non-existent, even for mobile phones and tv.

To overcome this, I had to purchase a program called Parrallels, which will run Windows 7
Then download Windows 7, more expense if you don't have it.
Download Quicken and Customer manager, no problem.
Download your favourite email program, I love Thunderbird by Mozilla.
Then you also have to buy a pdf converter for the invoices in order to email them , or do what I did and get a freebie from the 'net.

So after a couple of months mucking around and nearly throwing the Apple in the creek, I HOPE I now have it running right, only just got it set up properly (I hope), yesterday.

I also have a mobile eftpos machine that can also be tricky in the back blocks.
This is invaluable as many times the custard may not have quite enough cash on hand, or, "I've just written my last cheque", or as you write out the invoice, "I'll just duck down the bank and get some money".
My answer for the above?? "No worries, I've got an mobile eftpos machine".
Deal done.
Do your homework and ask questions about all aspects of any equipment and programs you will be using before you part with your hard earned doh ray me,

after all, it's YOUR money and you can spend it anywhere you want.
Hope this helps.
Shorty.