I'm not sure why you would go with the Lastolites if you're going to use these in a studio setting. They are mainly for on-the-go applications (being that they are collapsible). If you're static, then there are far cheaper, easier to use alternatives. The weakness of all Lastolite gear, IMO, are their stands/brackets... really cheap. Crappy actually. If you really want to go that route just look into Cowboy studio or the same ilk, reflector holders as they are exactly the same and not re-branded Lastolite. Also, the reflectors that come in the packages are not nearly as useful as picking up their Tri-grips and just using holders from any other makers. Then you get hand-holdables and can still use them as you can in the Triflector. You'll also get to chose from a number of different material that are not available in the kits.
If you're looking for more "professional" looking gear I'd def steer clear of Lastolite for in studio stuff. They look exceptional cheap and work quite poorly compared to real studio gear... C stands, Rollers, etc. Every studio I've ever worked in makes their own reflectors or gobos as they are dead simple to make and hold up with a decent C-stand you can bag or are free standing. This is especially true for work with clients... they knock and bang into things in studio often. The last thing you want is your beauty dish/reflectors/ lighting getting knocked over, destroyed and dinging your client in the head because you couldn't bag a cheap lightweight stand properly.
Obviously you'll go with what you're comfortable with but as I have gone down this path before, it's a big burn of money... like tripods or camera bags, buy exceptional quality first or you may end up circling back again and buying twice or three times. At 246$ for the Triflector on BH's site... you could def spend that money on a decent C-stand or a roller and hold up a lot of reflectors, a beauty dish and a gobo... easily. The reviews there are saying that same thing about the flimsy-ness of that rig, so I'm not the only one. You're going to have to buy stands too if you don't have any. That's pretty pricey when you can buy a C-stand for $115 and the accessories to attach reflectors for a few dollars more.
Best of luck...