This was a thoroughly enjoyable trek, and I would recommend it to anyone with a reasonable level of fitness and a love of mountain scenery. However, it is not a wilderness experience! The path to the Sanctuary is often quite narrow, and the only route. It can get quite busy at times, and on several occasions we found ourselves either stuck behind a slower moving group, or having to stop to let porters or groups going the opposite way pass.
Finally, a word of caution. Two of us went on the Chitwan extension after the trek, but found that it didn't live up to our expectations. The drive (in an aging Nissan Sunny with a leaky exhaust and nearly 200,000 on the clock, as opposed to the 4x4/high clearance vehicle that the rough roads really demanded) took over 6 hours each way, rather than the 4-5 hrs advertised. The actual time spent in the reserve was a day and a half, and the "full programme of activities" on the whole day there included a lot of waitng around in between said activities. The promised "before breakfast" activities, and the ox cart ride, completely failed to materialise, despite us bringing this to the attention of the staff (none of whom were affiliated to Exodus in any way). The food was indifferent at best, and the "hut" accomodation was a twin room on the upstairs floor of a house. All in all, neither of us felt that the product justified the description, or that at £400+ we had got good value for money.