Oooh, I just re-read your original question, you actually mention 5x7 film, not 4x5 film.
The Jobo CPE2 with lift is not readily capable of processing sheet film sizes larger than 4x5. You can if you wish use paper drums like you would as in paper developing, but in the long run I wouldnt suggest it. I have done this, but went to a film reel for my sheet film once I had one.
If you are in fact going to acquire a 5x7 camera, then, even if you have a reducing back allowing you to shoot 4x5 film, you will need either a bigger Jobo machine starting from the CPA-2 or CPP-2 upwards, or a higher specified again, ATL model, or you can use a roller base, which is cheap as, in comparison.
If indeed you are definitely going to acquire a 5x7 machine, then my suggestion is to move the CPE2 unit on, which is a pity as they are an excellent machine for developing of 135, 120 and 4x5 film, super consistently.
Rotary development of sheet film, has brought a real evenness of development to me. Compared to either inversion or dish/tray developing, this doesnt mean it is not viable, or even not any good, it is! I just wouldnt go back to either of those methods, unless I had no other way of developing my films.
With regard to film development by rotary development, in a machine with a tempering water bath and equipped with a lift, you can certainly obtain excellent to virtually perfect results, time after time after time. The real benefit of a lift is when and/or if you ever decide to develop C41, which, if you decide to shoot colour one day, is a real dandy accessory on a Jobo.
The reason is simple, C41 process runs at 37.7ºC (38ºC in practice) with the first bath being 315 long. Having a lift means that run after run, you can be really consistent in maintaining that 315 development and shutting further development down with a stop bath right on 315. This is not impossible with any other development method, as in tray/dish or inversion for example, but a real lot simpler with rotary development on a Jobo rotary processor.
If you ever do a reasonable amount of film developing, then rotary development does have advantages with sheet film, but you certainly can develop with many other methods at your disposal, with the simplest being tray/dish. Whether or not you do colour or B&W, the processes are identical, just the number of baths and the times are different, simple really.
Mick.