I'm a Mac user, too, which is one of the reasons I started playing on Lock to begin with. When they were on Merge their Mac platform was excellent; now it's not a true Mac platform at all.
Like you, I thought about buying a laptop PC, but I opted instead to buy Parallels so I could run Windows on all my Macs. It's cheaper than buying a whole new laptop and it's not so bad. In fact, one nice thing about running Lock on a Windows platform is that you can use the latest tracking/HUD software like PT4.
The software is so tilting if you're playing more than 4 tables. I definitely play less because the software makes play uncomfortable. I guess there plans to upgrade the software fell through.
Love playing on the site, hate waiting for dough and getting the runaround from Customer Service. Wish they would be a little more forthcoming on wait times, I think most of us would be a little more patient and understanding if they would just tell us like it really is.